{"transactions":[{"id":916797,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2026-02-06T22:07:40.000Z","date":"2026-02-06","kind":"gift","planned":false,"acquired":false,"shares":11100,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Bona fide gift to charitable organization. No compensation was given to the donor for the gifting of shares."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The balance of 149,351 shares includes 132 shares of common stock that were acquired by the Reporting Person on December 15, 2025, pursuant to the Tetra Tech, Inc. Employee Stock Purchase Plan (ESPP)."}],"balance_after":138251,"source":{"system":"sec-edgar","filing":"0001628280-26-006116","document":"wk-form4_1770415658.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000162828026006116/wk-form4_1770415658.xml","form_type":"4"}},{"id":984362,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2025-12-03T01:11:57.000Z","date":"2025-11-30","kind":"exercise","planned":false,"acquired":false,"shares":3682,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The RSUs become vested as to 25% of the shares on November 30, 2025, and 25% annually, thereafter, until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."}],"balance_after":11046,"derivative":{"exercise_date":"2025-11-30","underlying":"COMMON STOCK","underlying_shares":3682},"source":{"system":"sec-edgar","filing":"0001277150-25-000005","document":"wk-form4_1764724314.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/831641/000127715025000005/wk-form4_1764724314.xml","form_type":"4"}},{"id":984361,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2025-12-03T01:11:57.000Z","date":"2025-11-30","kind":"exercise","planned":false,"acquired":false,"shares":3645,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs become vested as to 25% of the shares on November 30, 2024, and 25% annually, thereafter, until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."}],"balance_after":7285,"derivative":{"exercise_date":"2024-11-30","underlying":"COMMON STOCK","underlying_shares":3645},"source":{"system":"sec-edgar","filing":"0001277150-25-000005","document":"wk-form4_1764724314.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/831641/000127715025000005/wk-form4_1764724314.xml","form_type":"4"}},{"id":984360,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2025-12-03T01:11:57.000Z","date":"2025-11-19","kind":"grant","planned":false,"acquired":true,"shares":19641,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs become vested as to 25% of the shares on November 30, 2026, and 25% annually, thereafter, until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."}],"balance_after":19641,"derivative":{"exercise_date":"2026-11-30","underlying":"COMMON STOCK","underlying_shares":19641},"source":{"system":"sec-edgar","filing":"0001277150-25-000005","document":"wk-form4_1764724314.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/831641/000127715025000005/wk-form4_1764724314.xml","form_type":"4"}},{"id":984359,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2025-12-03T01:11:57.000Z","date":"2025-11-30","kind":"tax_withholding","planned":false,"acquired":false,"shares":4044,"price":34.74,"value":140488.56,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the shares withheld to pay the related tax liability of the restricted stock units (RSUs) that vested on November 30, 2025."}],"balance_after":149219,"source":{"system":"sec-edgar","filing":"0001277150-25-000005","document":"wk-form4_1764724314.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000127715025000005/wk-form4_1764724314.xml","form_type":"4"}},{"id":984358,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2025-12-03T01:11:57.000Z","date":"2025-11-30","kind":"exercise","planned":false,"acquired":true,"shares":3682,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":153263,"source":{"system":"sec-edgar","filing":"0001277150-25-000005","document":"wk-form4_1764724314.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000127715025000005/wk-form4_1764724314.xml","form_type":"4"}},{"id":984357,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2025-12-03T01:11:57.000Z","date":"2025-11-30","kind":"exercise","planned":false,"acquired":true,"shares":3645,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":149581,"source":{"system":"sec-edgar","filing":"0001277150-25-000005","document":"wk-form4_1764724314.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000127715025000005/wk-form4_1764724314.xml","form_type":"4"}},{"id":993224,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2025-11-20T23:42:17.000Z","date":"2025-11-18","kind":"exercise","planned":false,"acquired":false,"shares":3170,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F8","text":"The RSUs become vested as to 25% of the shares on November 18, 2023, and 25% annually, thereafter, until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F7","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."}],"balance_after":3165,"derivative":{"exercise_date":"2023-11-18","underlying":"COMMON STOCK","underlying_shares":3170},"source":{"system":"sec-edgar","filing":"0001277150-25-000003","document":"wk-form4_1763682133.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/831641/000127715025000003/wk-form4_1763682133.xml","form_type":"4"}},{"id":993223,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2025-11-20T23:42:17.000Z","date":"2025-11-18","kind":"exercise","planned":false,"acquired":false,"shares":2520,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The RSUs become vested as to 25% of the shares on November 22, 2022, and 25% annually, thereafter, until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F7","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."}],"balance_after":0,"derivative":{"exercise_date":"2022-11-22","underlying":"COMMON STOCK","underlying_shares":2520},"source":{"system":"sec-edgar","filing":"0001277150-25-000003","document":"wk-form4_1763682133.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/831641/000127715025000003/wk-form4_1763682133.xml","form_type":"4"}},{"id":993222,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2025-11-20T23:42:17.000Z","date":"2025-11-18","kind":"tax_withholding","planned":false,"acquired":false,"shares":15112,"price":35.69,"value":539347.28,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Represents the shares withheld to pay the related tax liability of performance stock units that vested on November 18, 2025."}],"balance_after":145936,"source":{"system":"sec-edgar","filing":"0001277150-25-000003","document":"wk-form4_1763682133.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/831641/000127715025000003/wk-form4_1763682133.xml","form_type":"4"}},{"id":993221,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2025-11-20T23:42:17.000Z","date":"2025-11-18","kind":"grant","planned":false,"acquired":true,"shares":27384,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Shares acquired pursuant to vesting of performance stock units earned under 2018 Equity Incentive Plan."}],"balance_after":161048,"source":{"system":"sec-edgar","filing":"0001277150-25-000003","document":"wk-form4_1763682133.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/831641/000127715025000003/wk-form4_1763682133.xml","form_type":"4"}},{"id":993220,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2025-11-20T23:42:17.000Z","date":"2025-11-18","kind":"tax_withholding","planned":false,"acquired":false,"shares":3141,"price":35.69,"value":112102.29,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the shares withheld to pay the related tax liability of the restricted stock units (RSUs) that vested on November 18, 2025."}],"balance_after":133664,"source":{"system":"sec-edgar","filing":"0001277150-25-000003","document":"wk-form4_1763682133.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000127715025000003/wk-form4_1763682133.xml","form_type":"4"}},{"id":993219,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2025-11-20T23:42:17.000Z","date":"2025-11-18","kind":"exercise","planned":false,"acquired":true,"shares":3170,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":136805,"source":{"system":"sec-edgar","filing":"0001277150-25-000003","document":"wk-form4_1763682133.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000127715025000003/wk-form4_1763682133.xml","form_type":"4"}},{"id":993218,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2025-11-20T23:42:17.000Z","date":"2025-11-18","kind":"exercise","planned":false,"acquired":true,"shares":2520,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Amount of securities beneficially owned was updated to reflect that 149 shares of common stock were acquired by the Reporting Person on December 15, 2024, pursuant to the Tetra Tech, Inc. Employee Stock Purchase Plan (ESPP)."}],"balance_after":133635,"source":{"system":"sec-edgar","filing":"0001277150-25-000003","document":"wk-form4_1763682133.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000127715025000003/wk-form4_1763682133.xml","form_type":"4"}},{"id":1346118,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2024-12-04T00:58:29.000Z","date":"2024-11-30","kind":"exercise","planned":false,"acquired":false,"shares":3645,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs become vested as to 25% of the shares on November 30, 2024, and 25% annually, thereafter, until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"On September 6, 2024, the balance of 2,915 shares was updated pursuant to a 5 to 1 forward stock split, resulting in an additional 11,660 shares of common stock."}],"balance_after":10930,"derivative":{"exercise_date":"2024-11-30","underlying":"COMMON STOCK","underlying_shares":3645},"source":{"system":"sec-edgar","filing":"0000831641-24-000107","document":"wk-form4_1733273903.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164124000107/wk-form4_1733273903.xml","form_type":"4"}},{"id":1346117,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2024-12-04T00:58:29.000Z","date":"2024-11-30","kind":"tax_withholding","planned":false,"acquired":false,"shares":2008,"price":41.51,"value":83352.08,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the shares underlying restricted stock units (RSUs) that vested on November 30 2024, and were withheld to pay the related tax liability."}],"balance_after":130966,"source":{"system":"sec-edgar","filing":"0000831641-24-000107","document":"wk-form4_1733273903.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164124000107/wk-form4_1733273903.xml","form_type":"4"}},{"id":1346116,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2024-12-04T00:58:29.000Z","date":"2024-11-30","kind":"exercise","planned":false,"acquired":true,"shares":3645,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":132974,"source":{"system":"sec-edgar","filing":"0000831641-24-000107","document":"wk-form4_1733273903.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164124000107/wk-form4_1733273903.xml","form_type":"4"}},{"id":1355210,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2024-11-23T00:04:41.000Z","date":"2024-11-20","kind":"grant","planned":false,"acquired":true,"shares":14728,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The RSUs become vested as to 25% of the shares on November 30, 2025, and 25% annually, thereafter, until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."}],"balance_after":14728,"derivative":{"exercise_date":"2025-11-30","underlying":"COMMON STOCK","underlying_shares":14728},"source":{"system":"sec-edgar","filing":"0000831641-24-000084","document":"wk-form4_1732320274.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164124000084/wk-form4_1732320274.xml","form_type":"4"}},{"id":1355209,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2024-11-23T00:04:41.000Z","date":"2024-11-20","kind":"tax_withholding","planned":false,"acquired":false,"shares":15330,"price":40.22,"value":616572.6,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the combined number of shares withheld to pay the related tax liability of the PSUs that vested on November 20, 2024."}],"balance_after":129329,"source":{"system":"sec-edgar","filing":"0000831641-24-000084","document":"wk-form4_1732320274.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164124000084/wk-form4_1732320274.xml","form_type":"4"}},{"id":1355208,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2024-11-23T00:04:41.000Z","date":"2024-11-20","kind":"grant","planned":false,"acquired":true,"shares":27830,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares acquired pursuant to vesting of performance stock units (PSUs) earned under 2018 Equity Incentive Plan."}],"balance_after":144659,"source":{"system":"sec-edgar","filing":"0000831641-24-000084","document":"wk-form4_1732320274.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164124000084/wk-form4_1732320274.xml","form_type":"4"}},{"id":1357899,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2024-11-20T22:30:55.000Z","date":"2024-11-18","kind":"exercise","planned":false,"acquired":false,"shares":3170,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"Represents an award of RSUs, each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs become vested as to 25% of the shares on the first anniversary date, and 25% of the shares on each anniversary date thereafter until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F7","text":"On September 6, 2024, the balance of 1,901 shares was updated pursuant to a 5 to 1 forward stock split, resulting in an additional 7,604 shares of common stock."}],"balance_after":6335,"derivative":{"exercise_price":0,"exercise_date":"2023-11-18","underlying":"COMMON STOCK","underlying_shares":3170},"source":{"system":"sec-edgar","filing":"0000831641-24-000069","document":"wk-form4_1732141847.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164124000069/wk-form4_1732141847.xml","form_type":"4"}},{"id":1357898,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2024-11-20T22:30:55.000Z","date":"2024-11-18","kind":"exercise","planned":false,"acquired":false,"shares":2520,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"Represents an award of RSUs, each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs become vested as to 25% of the shares on the first anniversary date, and 25% of the shares on each anniversary date thereafter until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F6","text":"On September 6, 2024, the balance of 1,008 shares was updated pursuant to a 5 to 1 forward stock split, resulting in an additional 4,032 shares of common stock."}],"balance_after":2520,"derivative":{"exercise_price":0,"exercise_date":"2022-11-22","underlying":"COMMON STOCK","underlying_shares":2520},"source":{"system":"sec-edgar","filing":"0000831641-24-000069","document":"wk-form4_1732141847.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164124000069/wk-form4_1732141847.xml","form_type":"4"}},{"id":1357897,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2024-11-20T22:30:55.000Z","date":"2024-11-18","kind":"exercise","planned":false,"acquired":false,"shares":3685,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"Represents an award of RSUs, each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs become vested as to 25% of the shares on the first anniversary date, and 25% of the shares on each anniversary date thereafter until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F5","text":"On September 6, 2024, the balance of 737 shares was updated pursuant to a 5 to 1 forward stock split, resulting in an additional 2,948 shares of common stock."}],"balance_after":0,"derivative":{"exercise_price":0,"exercise_date":"2021-11-18","underlying":"COMMON STOCK","underlying_shares":3685},"source":{"system":"sec-edgar","filing":"0000831641-24-000069","document":"wk-form4_1732141847.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164124000069/wk-form4_1732141847.xml","form_type":"4"}},{"id":1357896,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2024-11-20T22:30:55.000Z","date":"2024-11-18","kind":"tax_withholding","planned":false,"acquired":false,"shares":5166,"price":41.12,"value":212425.92,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the shares underlying restricted stock units (RSUs) withheld to pay the related tax liability."}],"balance_after":116829,"source":{"system":"sec-edgar","filing":"0000831641-24-000069","document":"wk-form4_1732141847.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164124000069/wk-form4_1732141847.xml","form_type":"4"}},{"id":1357895,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2024-11-20T22:30:55.000Z","date":"2024-11-18","kind":"exercise","planned":false,"acquired":true,"shares":3170,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":121995,"source":{"system":"sec-edgar","filing":"0000831641-24-000069","document":"wk-form4_1732141847.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164124000069/wk-form4_1732141847.xml","form_type":"4"}},{"id":1357894,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2024-11-20T22:30:55.000Z","date":"2024-11-18","kind":"exercise","planned":false,"acquired":true,"shares":2520,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":118825,"source":{"system":"sec-edgar","filing":"0000831641-24-000069","document":"wk-form4_1732141847.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164124000069/wk-form4_1732141847.xml","form_type":"4"}},{"id":1357893,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2024-11-20T22:30:55.000Z","date":"2024-11-18","kind":"exercise","planned":false,"acquired":true,"shares":3685,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":116305,"source":{"system":"sec-edgar","filing":"0000831641-24-000069","document":"wk-form4_1732141847.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164124000069/wk-form4_1732141847.xml","form_type":"4"}},{"id":1409211,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2024-09-12T23:03:51.000Z","date":"2024-09-11","kind":"sale","planned":false,"acquired":false,"shares":36830,"price":46.57,"value":1715173.1,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.54 to $46.74, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"On September 6, 2024, the balance of 29,890 shares of common stock was updated pursuant to a 5 to 1  forward  stock split, resulting in an additional 119,560 shares of common stock."}],"balance_after":112620,"source":{"system":"sec-edgar","filing":"0000831641-24-000054","document":"wk-form4_1726182225.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164124000054/wk-form4_1726182225.xml","form_type":"4"}},{"id":1626906,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2024-02-22T23:31:32.000Z","date":"2024-02-22","kind":"sale","planned":false,"acquired":false,"shares":7515,"price":175.67,"value":1320160.05,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"All shares sold at an exact price."}],"balance_after":29890,"source":{"system":"sec-edgar","filing":"0000831641-24-000023","document":"wk-form4_1708644677.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164124000023/wk-form4_1708644677.xml","form_type":"4"}},{"id":1655969,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2024-02-08T01:04:14.000Z","date":"2024-02-05","kind":"sale","planned":false,"acquired":false,"shares":7128,"price":165.0087,"value":1176182.0136,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $164.815 to $165.18, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Amount of securities beneficially owned was updated to reflect that 35 shares of common stock were acquired by the Reporting Person on December 15, 2023, pursuant to the Tetra Tech, Inc. Employee Stock Purchase Plan (ESPP)."}],"balance_after":37405,"source":{"system":"sec-edgar","filing":"0000831641-24-000013","document":"wk-form4_1707354242.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164124000013/wk-form4_1707354242.xml","form_type":"4"}},{"id":1731886,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2023-11-23T00:55:14.000Z","date":"2023-11-21","kind":"grant","planned":false,"acquired":true,"shares":2915,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F3","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The RSUs become vested as to 25% of the shares on November 30, 2024, and 25% of the shares on each anniversary date thereafter until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."}],"balance_after":2915,"derivative":{"exercise_price":0,"exercise_date":"2024-11-30","underlying":"COMMON STOCK","underlying_shares":2915},"source":{"system":"sec-edgar","filing":"0000831641-23-000091","document":"wk-form4_1700700904.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164123000091/wk-form4_1700700904.xml","form_type":"4"}},{"id":1731885,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2023-11-23T00:55:14.000Z","date":"2023-11-21","kind":"tax_withholding","planned":false,"acquired":false,"shares":4098,"price":164.32,"value":673383.36,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the combined number of shares withheld to pay the related tax liability  of the performance stock units  that vested on November 21, 2023."}],"balance_after":44498,"source":{"system":"sec-edgar","filing":"0000831641-23-000091","document":"wk-form4_1700700904.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164123000091/wk-form4_1700700904.xml","form_type":"4"}},{"id":1731884,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2023-11-23T00:55:14.000Z","date":"2023-11-21","kind":"grant","planned":false,"acquired":true,"shares":7590,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares acquired pursuant to vesting of performance stock units (PSUs) earned under 2018 Equity Incentive Plan."}],"balance_after":48596,"source":{"system":"sec-edgar","filing":"0000831641-23-000091","document":"wk-form4_1700700904.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164123000091/wk-form4_1700700904.xml","form_type":"4"}},{"id":1733595,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2023-11-22T02:46:02.000Z","date":"2023-11-18","kind":"exercise","planned":false,"acquired":false,"shares":634,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The RSUs become vested as to 25% of the shares on November 18, 2023, and 25% of the shares on each anniversary date thereafter until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."}],"balance_after":1901,"derivative":{"exercise_price":0,"exercise_date":"2023-11-18","underlying":"COMMON STOCK","underlying_shares":634},"source":{"system":"sec-edgar","filing":"0000831641-23-000063","document":"wk-form4_1700621150.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164123000063/wk-form4_1700621150.xml","form_type":"4"}},{"id":1733594,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2023-11-22T02:46:02.000Z","date":"2023-11-18","kind":"exercise","planned":false,"acquired":false,"shares":504,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs become vested as to 25% of the shares on November 18, 2022, and 25% of the shares on each anniversary date thereafter until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."}],"balance_after":1008,"derivative":{"exercise_price":0,"exercise_date":"2022-11-22","underlying":"COMMON STOCK","underlying_shares":504},"source":{"system":"sec-edgar","filing":"0000831641-23-000063","document":"wk-form4_1700621150.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164123000063/wk-form4_1700621150.xml","form_type":"4"}},{"id":1733593,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2023-11-22T02:46:02.000Z","date":"2023-11-18","kind":"exercise","planned":false,"acquired":false,"shares":738,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The RSUs become vested as to 25% of the shares on November 18, 2021, and 25% of the shares on each anniversary date thereafter until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."}],"balance_after":737,"derivative":{"exercise_price":0,"exercise_date":"2021-11-18","underlying":"COMMON STOCK","underlying_shares":738},"source":{"system":"sec-edgar","filing":"0000831641-23-000063","document":"wk-form4_1700621150.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164123000063/wk-form4_1700621150.xml","form_type":"4"}},{"id":1733592,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2023-11-22T02:46:02.000Z","date":"2023-11-18","kind":"exercise","planned":false,"acquired":false,"shares":814,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The RSUs become vested as to 25% of the shares on November 18, 2020, and 25% of the shares on each anniversary date thereafter until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."}],"balance_after":0,"derivative":{"exercise_price":0,"exercise_date":"2020-11-18","underlying":"COMMON STOCK","underlying_shares":814},"source":{"system":"sec-edgar","filing":"0000831641-23-000063","document":"wk-form4_1700621150.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164123000063/wk-form4_1700621150.xml","form_type":"4"}},{"id":1733591,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2023-11-22T02:46:02.000Z","date":"2023-11-18","kind":"tax_withholding","planned":false,"acquired":false,"shares":1455,"price":165.1,"value":240220.5,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the shares underlying restricted stock units (RSUs) which vested on 11/18/2023 and were withheld to pay the related tax liability."}],"balance_after":41006,"source":{"system":"sec-edgar","filing":"0000831641-23-000063","document":"wk-form4_1700621150.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164123000063/wk-form4_1700621150.xml","form_type":"4"}},{"id":1733590,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2023-11-22T02:46:02.000Z","date":"2023-11-18","kind":"exercise","planned":false,"acquired":true,"shares":634,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":42461,"source":{"system":"sec-edgar","filing":"0000831641-23-000063","document":"wk-form4_1700621150.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164123000063/wk-form4_1700621150.xml","form_type":"4"}},{"id":1733589,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2023-11-22T02:46:02.000Z","date":"2023-11-18","kind":"exercise","planned":false,"acquired":true,"shares":504,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":41827,"source":{"system":"sec-edgar","filing":"0000831641-23-000063","document":"wk-form4_1700621150.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164123000063/wk-form4_1700621150.xml","form_type":"4"}},{"id":1733588,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2023-11-22T02:46:02.000Z","date":"2023-11-18","kind":"exercise","planned":false,"acquired":true,"shares":738,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":41323,"source":{"system":"sec-edgar","filing":"0000831641-23-000063","document":"wk-form4_1700621150.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164123000063/wk-form4_1700621150.xml","form_type":"4"}},{"id":1733587,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2023-11-22T02:46:02.000Z","date":"2023-11-18","kind":"exercise","planned":false,"acquired":true,"shares":814,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":40585,"source":{"system":"sec-edgar","filing":"0000831641-23-000063","document":"wk-form4_1700621150.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164123000063/wk-form4_1700621150.xml","form_type":"4"}},{"id":2027243,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2023-02-08T21:15:36.000Z","date":"2023-02-06","kind":"sale","acquired":false,"shares":10515,"price":151.1758,"value":1589613.537,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $150.47 to $152.08, inclusive."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Amount of securities beneficially owned was updated to reflect that 38 shares of common stock were acquired by the Reporting Person on December 15, 2022, pursuant to the Tetra Tech, Inc. Employee Stock Purchase Plan (ESPP)."}],"balance_after":39771,"source":{"system":"sec-edgar","filing":"0000831641-23-000013","document":"wf-form4_167589091696142.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164123000013/wf-form4_167589091696142.xml","form_type":"4"}},{"id":2107691,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2022-11-23T01:57:09.000Z","date":"2022-11-18","kind":"exercise","acquired":false,"shares":505,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"The RSUs become vested as to 25% of the shares on November 18, 2022, and the anniversary of that date going forward until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date"}],"balance_after":1512,"derivative":{"exercise_price":0,"exercise_date":"2022-11-22","underlying":"COMMON STOCK","underlying_shares":505},"source":{"system":"sec-edgar","filing":"0000831641-22-000100","document":"wf-form4_166916858242831.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164122000100/wf-form4_166916858242831.xml","form_type":"4"}},{"id":2107690,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2022-11-23T01:57:09.000Z","date":"2022-11-18","kind":"exercise","acquired":false,"shares":738,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The RSUs become vested as to 25% of the shares on November 18, 2021, and the anniversary of that date going forward until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date"}],"balance_after":1475,"derivative":{"exercise_price":0,"exercise_date":"2021-11-18","underlying":"COMMON STOCK","underlying_shares":738},"source":{"system":"sec-edgar","filing":"0000831641-22-000100","document":"wf-form4_166916858242831.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164122000100/wf-form4_166916858242831.xml","form_type":"4"}},{"id":2107689,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2022-11-23T01:57:09.000Z","date":"2022-11-18","kind":"exercise","acquired":false,"shares":814,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs become vested as to 25% of the shares on November 18, 2020, and the anniversary of that date going forward until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date"}],"balance_after":814,"derivative":{"exercise_price":0,"exercise_date":"2020-11-18","underlying":"COMMON STOCK","underlying_shares":814},"source":{"system":"sec-edgar","filing":"0000831641-22-000100","document":"wf-form4_166916858242831.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164122000100/wf-form4_166916858242831.xml","form_type":"4"}},{"id":2107688,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2022-11-23T01:57:09.000Z","date":"2022-11-18","kind":"exercise","acquired":false,"shares":1000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs become vested as to 25% of the shares on November 18, 2019, and the anniversary of that date going forward until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date"}],"balance_after":0,"derivative":{"exercise_price":0,"exercise_date":"2019-11-18","underlying":"COMMON STOCK","underlying_shares":1000},"source":{"system":"sec-edgar","filing":"0000831641-22-000100","document":"wf-form4_166916858242831.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164122000100/wf-form4_166916858242831.xml","form_type":"4"}},{"id":2107687,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2022-11-23T01:57:09.000Z","date":"2022-11-18","kind":"tax_withholding","acquired":false,"shares":6823,"price":156.63,"value":1068686.49,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the combined number of shares withheld to pay the related tax liability on a total of 9,578 performance stock units (PSUs) and 3,057  restricted stock units (RSUs), which vested on November 23, 2022."}],"balance_after":50248,"source":{"system":"sec-edgar","filing":"0000831641-22-000100","document":"wf-form4_166916858242831.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164122000100/wf-form4_166916858242831.xml","form_type":"4"}},{"id":2107686,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2022-11-23T01:57:09.000Z","date":"2022-11-18","kind":"exercise","acquired":true,"shares":505,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":57071,"source":{"system":"sec-edgar","filing":"0000831641-22-000100","document":"wf-form4_166916858242831.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164122000100/wf-form4_166916858242831.xml","form_type":"4"}},{"id":2107685,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2022-11-23T01:57:09.000Z","date":"2022-11-18","kind":"exercise","acquired":true,"shares":738,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":56566,"source":{"system":"sec-edgar","filing":"0000831641-22-000100","document":"wf-form4_166916858242831.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164122000100/wf-form4_166916858242831.xml","form_type":"4"}},{"id":2107684,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2022-11-23T01:57:09.000Z","date":"2022-11-18","kind":"exercise","acquired":true,"shares":814,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":55828,"source":{"system":"sec-edgar","filing":"0000831641-22-000100","document":"wf-form4_166916858242831.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164122000100/wf-form4_166916858242831.xml","form_type":"4"}},{"id":2107683,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2022-11-23T01:57:09.000Z","date":"2022-11-18","kind":"exercise","acquired":true,"shares":1000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":55014,"source":{"system":"sec-edgar","filing":"0000831641-22-000100","document":"wf-form4_166916858242831.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164122000100/wf-form4_166916858242831.xml","form_type":"4"}},{"id":2107682,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2022-11-23T01:57:09.000Z","date":"2022-11-18","kind":"grant","acquired":true,"shares":9578,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Shares acquired pursuant to vesting of performance stock units (PSUs) earned under 2018 Equity Incentive Plan."}],"balance_after":54014,"source":{"system":"sec-edgar","filing":"0000831641-22-000100","document":"wf-form4_166916858242831.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164122000100/wf-form4_166916858242831.xml","form_type":"4"}},{"id":2111049,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2022-11-19T00:37:31.000Z","date":"2022-11-16","kind":"grant","acquired":true,"shares":2535,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The RSUs become vested as to 25% of the shares on November 18, 2023, and 25% of the shares on each anniversary date thereafter until fully vested."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs are exercisable at the time of vesting and do not have a set expiration date."}],"balance_after":2535,"derivative":{"exercise_price":0,"exercise_date":"2023-11-18","underlying":"COMMON STOCK","underlying_shares":2535},"source":{"system":"sec-edgar","filing":"0000831641-22-000068","document":"wf-form4_166881823754231.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164122000068/wf-form4_166881823754231.xml","form_type":"4"}},{"id":2478124,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2021-12-10T22:14:58.000Z","date":"2021-12-08","kind":"sale","acquired":false,"shares":16132,"price":188.731,"value":3044608.492,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"$188.730952 is an average price. Shares were sold at prices ranging from $187.42 to $190.57 per share."}],"balance_after":44393,"source":{"system":"sec-edgar","filing":"0000831641-21-000163","document":"wf-form4_163917448213000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000163/wf-form4_163917448213000.xml","form_type":"4"}},{"id":2487311,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"STOCK OPTION (RIGHT TO BUY)","published_at":"2021-12-04T01:10:19.000Z","date":"2021-12-03","kind":"exercise","acquired":false,"shares":2790,"price":47.95,"value":133780.5,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The option becomes exercisable as to 25% of the shares on each anniversary of the grant date."}],"balance_after":0,"derivative":{"exercise_price":47.95,"exercise_date":"2018-11-17","expiration_date":"2027-11-17","underlying":"COMMON STOCK","underlying_shares":2790},"source":{"system":"sec-edgar","filing":"0000831641-21-000154","document":"wf-form4_163858020411335.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000154/wf-form4_163858020411335.xml","form_type":"4"}},{"id":2487310,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2021-12-04T01:10:19.000Z","date":"2021-12-03","kind":"sale","acquired":false,"shares":2790,"price":185.1781,"value":516646.899,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"$185.178110 is an average price. Shares were sold at prices ranging from $185.161 to $185.70 per share."}],"balance_after":60525,"source":{"system":"sec-edgar","filing":"0000831641-21-000154","document":"wf-form4_163858020411335.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000154/wf-form4_163858020411335.xml","form_type":"4"}},{"id":2487309,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2021-12-04T01:10:19.000Z","date":"2021-12-03","kind":"exercise","acquired":true,"shares":2790,"price":47.95,"value":133780.5,"ownership":{"direct":true},"balance_after":63315,"source":{"system":"sec-edgar","filing":"0000831641-21-000154","document":"wf-form4_163858020411335.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000154/wf-form4_163858020411335.xml","form_type":"4"}},{"id":2496683,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2021-11-25T00:58:36.000Z","date":"2021-11-23","kind":"grant","acquired":true,"shares":2017,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs become vested as to 25% of the shares on November 18, 2022, and the anniversary of that date going forward until fully vested."}],"balance_after":2017,"derivative":{"exercise_price":0,"exercise_date":"2022-11-18","expiration_date":"2025-11-18","underlying":"COMMON STOCK","underlying_shares":2017},"source":{"system":"sec-edgar","filing":"0000831641-21-000135","document":"wf-form4_163780190131173.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000135/wf-form4_163780190131173.xml","form_type":"4"}},{"id":2496682,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2021-11-25T00:58:36.000Z","date":"2021-11-23","kind":"tax_withholding","acquired":false,"shares":6484,"price":190.38,"value":1234423.92,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the combined number of shares withheld to pay the related tax liability on a total of 12,010 performance stock units (PSUs) which vested on November 23, 2021."}],"balance_after":60525,"source":{"system":"sec-edgar","filing":"0000831641-21-000135","document":"wf-form4_163780190131173.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000135/wf-form4_163780190131173.xml","form_type":"4"}},{"id":2496681,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2021-11-25T00:58:36.000Z","date":"2021-11-23","kind":"grant","acquired":true,"shares":12010,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Shares acquired pursuant to vesting of performance stock units (PSUs) earned under 2018 Equity Incentive Plan."}],"balance_after":67009,"source":{"system":"sec-edgar","filing":"0000831641-21-000135","document":"wf-form4_163780190131173.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000135/wf-form4_163780190131173.xml","form_type":"4"}},{"id":2501662,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2021-11-23T00:40:48.000Z","date":"2021-11-18","kind":"exercise","acquired":false,"shares":738,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The RSUs become vested as to 25% of the shares on November 18, 2021, and the anniversary of that date going forward until fully vested."}],"balance_after":2213,"derivative":{"exercise_price":0,"exercise_date":"2021-11-18","expiration_date":"2024-11-19","underlying":"COMMON STOCK","underlying_shares":738},"source":{"system":"sec-edgar","filing":"0000831641-21-000094","document":"wf-form4_163762803309326.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000094/wf-form4_163762803309326.xml","form_type":"4"}},{"id":2501661,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2021-11-23T00:40:48.000Z","date":"2021-11-18","kind":"exercise","acquired":false,"shares":815,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The RSUs become vested as to 25% of the shares on November 18, 2020, and the anniversary of that date going forward until fully vested."}],"balance_after":1628,"derivative":{"exercise_price":0,"exercise_date":"2020-11-18","expiration_date":"2023-11-21","underlying":"COMMON STOCK","underlying_shares":815},"source":{"system":"sec-edgar","filing":"0000831641-21-000094","document":"wf-form4_163762803309326.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000094/wf-form4_163762803309326.xml","form_type":"4"}},{"id":2501660,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2021-11-23T00:40:48.000Z","date":"2021-11-18","kind":"exercise","acquired":false,"shares":1001,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs become vested as to 25% of the shares on November 18, 2019, and the anniversary of that date going forward until fully vested."}],"balance_after":1000,"derivative":{"exercise_price":0,"exercise_date":"2019-11-18","expiration_date":"2022-11-18","underlying":"COMMON STOCK","underlying_shares":1001},"source":{"system":"sec-edgar","filing":"0000831641-21-000094","document":"wf-form4_163762803309326.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000094/wf-form4_163762803309326.xml","form_type":"4"}},{"id":2501659,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2021-11-23T00:40:48.000Z","date":"2021-11-18","kind":"tax_withholding","acquired":false,"shares":1844,"price":187.88,"value":346450.72,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the combined number of shares withheld to pay the related tax liability on a total of 3,413 restricted stock units (RSUs) which vested on 11/18/2021."}],"balance_after":56690,"source":{"system":"sec-edgar","filing":"0000831641-21-000094","document":"wf-form4_163762803309326.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000094/wf-form4_163762803309326.xml","form_type":"4"}},{"id":2501658,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2021-11-23T00:40:48.000Z","date":"2021-11-18","kind":"exercise","acquired":true,"shares":738,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The award becomes vested as to 25% of the RSUs on the anniversary of the grant date."}],"balance_after":58534,"source":{"system":"sec-edgar","filing":"0000831641-21-000094","document":"wf-form4_163762803309326.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000094/wf-form4_163762803309326.xml","form_type":"4"}},{"id":2501657,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2021-11-23T00:40:48.000Z","date":"2021-11-18","kind":"exercise","acquired":true,"shares":815,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The award becomes vested as to 25% of the RSUs on the anniversary of the grant date."}],"balance_after":57796,"source":{"system":"sec-edgar","filing":"0000831641-21-000094","document":"wf-form4_163762803309326.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000094/wf-form4_163762803309326.xml","form_type":"4"}},{"id":2501656,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2021-11-23T00:40:48.000Z","date":"2021-11-18","kind":"exercise","acquired":true,"shares":1001,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The award becomes vested as to 25% of the RSUs on the anniversary of the grant date."}],"balance_after":56981,"source":{"system":"sec-edgar","filing":"0000831641-21-000094","document":"wf-form4_163762803309326.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000094/wf-form4_163762803309326.xml","form_type":"4"}},{"id":2879899,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2021-02-04T23:20:23.000Z","date":"2021-02-03","kind":"sale","acquired":false,"shares":10801,"price":129.4546,"value":1398239.1346,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"$129.4546 is an average price. Shares were sold at prices ranging from $128.86 to $129.46 per share."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Amount of securities beneficially owned was updated to reflect that 58 shares of common stock were acquired by the Reporting Person on December 15, 2020, pursuant to the Tetra Tech, Inc. Employee Stock Purchase Plan (ESPP)."}],"balance_after":55980,"source":{"system":"sec-edgar","filing":"0000831641-21-000017","document":"wf-form4_161248081020193.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164121000017/wf-form4_161248081020193.xml","form_type":"4"}},{"id":2971978,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2020-11-20T23:07:52.000Z","date":"2020-11-18","kind":"grant","acquired":true,"shares":2951,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F9","text":"The RSUs become vested as to 25% of the shares on November 18, 2021, and the anniversary of that date going forward until fully vested."}],"balance_after":2951,"derivative":{"exercise_price":0,"exercise_date":"2021-11-18","expiration_date":"2024-11-19","underlying":"COMMON STOCK","underlying_shares":2951},"source":{"system":"sec-edgar","filing":"0000831641-20-000135","document":"wf-form4_160591365524434.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000135/wf-form4_160591365524434.xml","form_type":"4"}},{"id":2971977,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2020-11-20T23:07:52.000Z","date":"2020-11-18","kind":"exercise","acquired":false,"shares":815,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F8","text":"The RSUs become vested as to 25% of the shares on November 18, 2020, and the anniversary of that date going forward until fully vested."}],"balance_after":2443,"derivative":{"exercise_price":0,"exercise_date":"2020-11-18","expiration_date":"2023-11-21","underlying":"COMMON STOCK","underlying_shares":815},"source":{"system":"sec-edgar","filing":"0000831641-20-000135","document":"wf-form4_160591365524434.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000135/wf-form4_160591365524434.xml","form_type":"4"}},{"id":2971976,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2020-11-20T23:07:52.000Z","date":"2020-11-18","kind":"exercise","acquired":false,"shares":1001,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"The RSUs become vested as to 25% of the shares on November 18, 2019, and the anniversary of that date until fully vested."}],"balance_after":2002,"derivative":{"exercise_price":0,"exercise_date":"2019-11-18","expiration_date":"2022-11-18","underlying":"COMMON STOCK","underlying_shares":1001},"source":{"system":"sec-edgar","filing":"0000831641-20-000135","document":"wf-form4_160591365524434.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000135/wf-form4_160591365524434.xml","form_type":"4"}},{"id":2971975,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"STOCK OPTION (RIGHT TO BUY)","published_at":"2020-11-20T23:07:52.000Z","date":"2020-11-18","kind":"exercise","acquired":false,"shares":8371,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The option becomes exercisable as to 25% of the shares on each anniversary of the grant date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"The option granted expires 10 years after the grant date."}],"balance_after":2790,"derivative":{"exercise_price":47.95,"exercise_date":"2018-11-17","expiration_date":"2027-11-17","underlying":"COMMON STOCK","underlying_shares":8371},"source":{"system":"sec-edgar","filing":"0000831641-20-000135","document":"wf-form4_160591365524434.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000135/wf-form4_160591365524434.xml","form_type":"4"}},{"id":2971974,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"STOCK OPTION (RIGHT TO BUY)","published_at":"2020-11-20T23:07:52.000Z","date":"2020-11-18","kind":"exercise","acquired":false,"shares":11427,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The option becomes exercisable as to 25% of the shares on each anniversary of the grant date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"The option granted expires 10 years after the grant date."}],"balance_after":0,"derivative":{"exercise_price":40.8,"exercise_date":"2017-11-18","expiration_date":"2026-11-18","underlying":"COMMON STOCK","underlying_shares":11427},"source":{"system":"sec-edgar","filing":"0000831641-20-000135","document":"wf-form4_160591365524434.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000135/wf-form4_160591365524434.xml","form_type":"4"}},{"id":2971973,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2020-11-20T23:07:52.000Z","date":"2020-11-18","kind":"tax_withholding","acquired":false,"shares":9338,"price":122,"value":1139236.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Represents the combined number of shares withheld to pay the related tax liability on a total of 13,756 performance stock units (PSUs) and 3,538 restricted stock units (RSUs) which vested on 11/18/2020."}],"balance_after":66723,"source":{"system":"sec-edgar","filing":"0000831641-20-000135","document":"wf-form4_160591365524434.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000135/wf-form4_160591365524434.xml","form_type":"4"}},{"id":2971972,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2020-11-20T23:07:52.000Z","date":"2020-11-18","kind":"grant","acquired":true,"shares":13756,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Shares acquired pursuant to vesting of performance stock units (PSUs) earned under 2015 Equity Incentive Plan."}],"balance_after":76061,"source":{"system":"sec-edgar","filing":"0000831641-20-000135","document":"wf-form4_160591365524434.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000135/wf-form4_160591365524434.xml","form_type":"4"}},{"id":2971971,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2020-11-20T23:07:52.000Z","date":"2020-11-18","kind":"exercise","acquired":true,"shares":815,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Shares automatically acquired upon the vesting of restricted stock units (RSUs)."}],"balance_after":62305,"source":{"system":"sec-edgar","filing":"0000831641-20-000135","document":"wf-form4_160591365524434.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000135/wf-form4_160591365524434.xml","form_type":"4"}},{"id":2971970,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2020-11-20T23:07:52.000Z","date":"2020-11-18","kind":"exercise","acquired":true,"shares":1001,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Shares automatically acquired upon the vesting of restricted stock units (RSUs)."}],"balance_after":61490,"source":{"system":"sec-edgar","filing":"0000831641-20-000135","document":"wf-form4_160591365524434.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000135/wf-form4_160591365524434.xml","form_type":"4"}},{"id":2971969,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2020-11-20T23:07:52.000Z","date":"2020-11-18","kind":"sale","acquired":false,"shares":19798,"price":123.4059,"value":2443190.0082,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"$123.4059 is an average price. Shares were sold at prices ranging from $122.00 to $125.37 per share."}],"balance_after":60489,"source":{"system":"sec-edgar","filing":"0000831641-20-000135","document":"wf-form4_160591365524434.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000135/wf-form4_160591365524434.xml","form_type":"4"}},{"id":2971968,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2020-11-20T23:07:52.000Z","date":"2020-11-18","kind":"exercise","acquired":true,"shares":8371,"price":47.95,"value":401389.45,"ownership":{"direct":true},"balance_after":80287,"source":{"system":"sec-edgar","filing":"0000831641-20-000135","document":"wf-form4_160591365524434.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000135/wf-form4_160591365524434.xml","form_type":"4"}},{"id":2971967,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2020-11-20T23:07:52.000Z","date":"2020-11-18","kind":"exercise","acquired":true,"shares":11427,"price":40.8,"value":466221.6,"ownership":{"direct":true},"balance_after":71916,"source":{"system":"sec-edgar","filing":"0000831641-20-000135","document":"wf-form4_160591365524434.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000135/wf-form4_160591365524434.xml","form_type":"4"}},{"id":3068533,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"STOCK OPTION (RIGHT TO BUY)","published_at":"2020-08-05T23:20:06.000Z","date":"2020-08-05","kind":"exercise","acquired":false,"shares":17622,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The option became exercisable as to 25% of the shares on each anniversary of the grant date."}],"balance_after":0,"derivative":{"exercise_price":27.16,"exercise_date":"2016-11-20","expiration_date":"2025-11-20","underlying":"COMMON STOCK","underlying_shares":17622},"source":{"system":"sec-edgar","filing":"0000831641-20-000069","document":"wf-form4_159666958655705.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000069/wf-form4_159666958655705.xml","form_type":"4"}},{"id":3068532,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2020-08-05T23:20:06.000Z","date":"2020-08-05","kind":"sale","acquired":false,"shares":17622,"price":91.3783,"value":1610268.4026,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"$91.3783 is an average price. Shares were sold at prices ranging from $91.02 to $91.64 per share."}],"balance_after":60489,"source":{"system":"sec-edgar","filing":"0000831641-20-000069","document":"wf-form4_159666958655705.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000069/wf-form4_159666958655705.xml","form_type":"4"}},{"id":3068531,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2020-08-05T23:20:06.000Z","date":"2020-08-05","kind":"exercise","acquired":true,"shares":17622,"price":27.16,"value":478613.52,"ownership":{"direct":true},"balance_after":78111,"source":{"system":"sec-edgar","filing":"0000831641-20-000069","document":"wf-form4_159666958655705.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000069/wf-form4_159666958655705.xml","form_type":"4"}},{"id":3278327,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"STOCK OPTION (RIGHT TO BUY)","published_at":"2020-02-12T23:55:51.000Z","date":"2020-02-10","kind":"exercise","acquired":false,"shares":16229,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The option became exercisable as to 25% of the shares on each anniversary of the grant date."}],"balance_after":0,"derivative":{"exercise_price":27.26,"exercise_date":"2015-11-21","expiration_date":"2022-11-21","underlying":"COMMON STOCK","underlying_shares":16229},"source":{"system":"sec-edgar","filing":"0000831641-20-000034","document":"wf-form4_158155173451013.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000034/wf-form4_158155173451013.xml","form_type":"4"}},{"id":3278326,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2020-02-12T23:55:51.000Z","date":"2020-02-10","kind":"sale","acquired":false,"shares":16229,"price":95.2722,"value":1546172.5338,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"$95.2722 is an average price. Shares were sold at prices ranging from $94.92 to $95.43 per share."}],"balance_after":60489,"source":{"system":"sec-edgar","filing":"0000831641-20-000034","document":"wf-form4_158155173451013.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000034/wf-form4_158155173451013.xml","form_type":"4"}},{"id":3278325,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2020-02-12T23:55:51.000Z","date":"2020-02-10","kind":"exercise","acquired":true,"shares":16229,"price":27.26,"value":442402.54,"ownership":{"direct":true},"balance_after":76718,"source":{"system":"sec-edgar","filing":"0000831641-20-000034","document":"wf-form4_158155173451013.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000034/wf-form4_158155173451013.xml","form_type":"4"}},{"id":3285493,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"STOCK OPTION (RIGHT TO BUY)","published_at":"2020-02-07T23:46:29.000Z","date":"2020-02-06","kind":"exercise","acquired":false,"shares":23143,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The option became exercisable as to 25% of the shares on each anniversary of the grant date."}],"balance_after":0,"derivative":{"exercise_price":28.58,"exercise_date":"2014-11-22","expiration_date":"2021-11-22","underlying":"COMMON STOCK","underlying_shares":23143},"source":{"system":"sec-edgar","filing":"0000831641-20-000028","document":"wf-form4_158111917180404.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000028/wf-form4_158111917180404.xml","form_type":"4"}},{"id":3285492,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2020-02-07T23:46:29.000Z","date":"2020-02-06","kind":"sale","acquired":false,"shares":23143,"price":92.4046,"value":2138519.6578,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"$92.4046 is an average price. Shares were sold at prices ranging from $91.78 to $92.97 per share."}],"balance_after":60489,"source":{"system":"sec-edgar","filing":"0000831641-20-000028","document":"wf-form4_158111917180404.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000028/wf-form4_158111917180404.xml","form_type":"4"}},{"id":3285491,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2020-02-07T23:46:29.000Z","date":"2020-02-06","kind":"exercise","acquired":true,"shares":23143,"price":28.58,"value":661426.94,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Amount of securities beneficially owned was updated to reflect that 96 shares of common stock were acquired by the Reporting Person on December 13, 2019, pursuant to the Tetra Tech, Inc. Employee Stock Purchase Plan (ESPP)."}],"balance_after":83632,"source":{"system":"sec-edgar","filing":"0000831641-20-000028","document":"wf-form4_158111917180404.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164120000028/wf-form4_158111917180404.xml","form_type":"4"}},{"id":3358100,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"EMPLOYEE STOCK OPTION (RIGHT TO BUY)","published_at":"2019-11-27T23:55:41.000Z","date":"2019-11-25","kind":"exercise","acquired":false,"shares":16000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The option became exercisable as to 25% of the shares on each anniversary of the grant date."}],"balance_after":0,"derivative":{"exercise_price":24.26,"exercise_date":"2013-11-16","expiration_date":"2020-11-16","underlying":"COMMON STOCK","underlying_shares":16000},"source":{"system":"sec-edgar","filing":"0000831641-19-000194","document":"wf-form4_157489892231386.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000194/wf-form4_157489892231386.xml","form_type":"4"}},{"id":3358099,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2019-11-27T23:55:41.000Z","date":"2019-11-25","kind":"sale","acquired":false,"shares":16000,"price":87.4254,"value":1398806.4,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"$87.4254 is an average price. Shares were sold at prices ranging from $86.86 to $88.24 per share."}],"balance_after":60393,"source":{"system":"sec-edgar","filing":"0000831641-19-000194","document":"wf-form4_157489892231386.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000194/wf-form4_157489892231386.xml","form_type":"4"}},{"id":3358098,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2019-11-27T23:55:41.000Z","date":"2019-11-25","kind":"exercise","acquired":true,"shares":16000,"price":24.26,"value":388160.0,"ownership":{"direct":true},"balance_after":76393,"source":{"system":"sec-edgar","filing":"0000831641-19-000194","document":"wf-form4_157489892231386.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000194/wf-form4_157489892231386.xml","form_type":"4"}},{"id":3361933,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2019-11-22T21:34:28.000Z","date":"2019-11-21","kind":"grant","acquired":true,"shares":3258,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The restricted stock units (RSUs) vest in four equal annual installments beginning on November 18, 2020."}],"balance_after":3258,"derivative":{"exercise_price":0,"exercise_date":"2020-11-18","expiration_date":"2023-11-18","underlying":"COMMON STOCK","underlying_shares":3258},"source":{"system":"sec-edgar","filing":"0000831641-19-000171","document":"wf-form4_157445845306304.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000171/wf-form4_157445845306304.xml","form_type":"4"}},{"id":3361932,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2019-11-22T21:34:28.000Z","date":"2019-11-20","kind":"tax_withholding","acquired":false,"shares":704,"price":86.28,"value":60741.12,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares withheld to pay the related tax liability on a total of 1,304 restricted stock units (RSUs) which vested on 11/20/2019."}],"balance_after":60393,"source":{"system":"sec-edgar","filing":"0000831641-19-000171","document":"wf-form4_157445845306304.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000171/wf-form4_157445845306304.xml","form_type":"4"}},{"id":3364879,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)","published_at":"2019-11-21T01:25:26.000Z","date":"2019-11-18","kind":"exercise","acquired":true,"shares":1001,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The restricted stock units (RSUs) vest in four equal annual installments beginning on November 18, 2019."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"The restricted stock units (RSUs) vest in four equal annual installments beginning on November 18, 2019."}],"balance_after":3003,"derivative":{"exercise_price":0,"exercise_date":"2019-11-18","expiration_date":"2022-11-18","underlying":"COMMON STOCK","underlying_shares":1001},"source":{"system":"sec-edgar","filing":"0000831641-19-000120","document":"wf-form4_157429951076908.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000120/wf-form4_157429951076908.xml","form_type":"4"}},{"id":3364878,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2019-11-21T01:25:26.000Z","date":"2019-11-18","kind":"tax_withholding","acquired":false,"shares":6335,"price":87.15,"value":552095.25,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","text":"Represents the shares underlying PSUs which vested on 11/18/2019 and were withheld to pay the related tax liability."}],"balance_after":61097,"source":{"system":"sec-edgar","filing":"0000831641-19-000120","document":"wf-form4_157429951076908.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000120/wf-form4_157429951076908.xml","form_type":"4"}},{"id":3364877,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2019-11-21T01:25:26.000Z","date":"2019-11-18","kind":"grant","acquired":true,"shares":11735,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Shares acquired pursuant to vesting of performance stock units (PSUs) earned under 2015 Equity Incentive Plan."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Each PSU represented the right to receive one share of Tetra Tech common stock."}],"balance_after":67432,"source":{"system":"sec-edgar","filing":"0000831641-19-000120","document":"wf-form4_157429951076908.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000120/wf-form4_157429951076908.xml","form_type":"4"}},{"id":3364876,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2019-11-21T01:25:26.000Z","date":"2019-11-18","kind":"tax_withholding","acquired":false,"shares":1472,"price":87.15,"value":128284.8,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the number of shares withheld to pay the related tax liability on a total of 2,724 restricted stock units (RSUs) which vested on 11/18/2019."}],"balance_after":55697,"source":{"system":"sec-edgar","filing":"0000831641-19-000120","document":"wf-form4_157429951076908.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000120/wf-form4_157429951076908.xml","form_type":"4"}},{"id":3364875,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":67479,"kind":"person","name":"BURDICK STEVEN M","position":1,"cik":"0001277150","reported_name":"BURDICK STEVEN M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"COMMON STOCK","published_at":"2019-11-21T01:25:26.000Z","date":"2019-11-18","kind":"exercise","acquired":true,"shares":1001,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock."}],"balance_after":57169,"source":{"system":"sec-edgar","filing":"0000831641-19-000120","document":"wf-form4_157429951076908.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164119000120/wf-form4_157429951076908.xml","form_type":"4"}}],"next_cursor":"2019-11-21T01:25:26.000000Z,3364875"}