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Therefore, 200% of the 2,713 PSUs awarded on November 21, 2014 were earned and vested on November 21, 2017."}],"balance_after":77359,"source":{"system":"sec-edgar","filing":"0000831641-17-000092","document":"wf-form4_151138571234651.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164117000092/wf-form4_151138571234651.xml","form_type":"4"}},{"id":4155388,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122593,"kind":"person","name":"BROWNLIE WILLIAM R","position":1,"cik":"0001346227","reported_name":"BROWNLIE WILLIAM R","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, CHIEF ENGINEER"}}],"security":"STOCK OPTION (RIGHT TO BUY)","published_at":"2017-11-21T22:12:22.000Z","date":"2017-11-17","kind":"grant","acquired":true,"shares":5580,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The option becomes exercisable as to 25% of the Shares on each anniversary of the grant date."}],"balance_after":5580,"derivative":{"exercise_price":47.95,"exercise_date":"2018-11-17","expiration_date":"2027-11-17","underlying":"COMMON STOCK","underlying_shares":5580},"source":{"system":"sec-edgar","filing":"0000831641-17-000049","document":"wf-form4_151130232690861.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164117000049/wf-form4_151130232690861.xml","form_type":"4"}},{"id":4155387,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122593,"kind":"person","name":"BROWNLIE WILLIAM R","position":1,"cik":"0001346227","reported_name":"BROWNLIE WILLIAM R","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, CHIEF ENGINEER"}}],"security":"COMMON STOCK","published_at":"2017-11-21T22:12:22.000Z","date":"2017-11-20","kind":"tax_withholding","acquired":false,"shares":268,"price":48.55,"value":13011.4,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"268 of the shares underlying restricted stock which vested on 11/20/2017 were withheld to pay the related tax liability."}],"balance_after":71933,"source":{"system":"sec-edgar","filing":"0000831641-17-000049","document":"wf-form4_151130232690861.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164117000049/wf-form4_151130232690861.xml","form_type":"4"}},{"id":4155386,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122593,"kind":"person","name":"BROWNLIE WILLIAM R","position":1,"cik":"0001346227","reported_name":"BROWNLIE WILLIAM R","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, CHIEF ENGINEER"}}],"security":"COMMON STOCK","published_at":"2017-11-21T22:12:22.000Z","date":"2017-11-18","kind":"tax_withholding","acquired":false,"shares":184,"price":47.95,"value":8822.8,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"184 of the shares underlying restricted stock which vested on 11/18/2017 were withheld to pay the related tax liability."}],"balance_after":72201,"source":{"system":"sec-edgar","filing":"0000831641-17-000049","document":"wf-form4_151130232690861.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164117000049/wf-form4_151130232690861.xml","form_type":"4"}},{"id":4155385,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122593,"kind":"person","name":"BROWNLIE WILLIAM R","position":1,"cik":"0001346227","reported_name":"BROWNLIE WILLIAM R","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, CHIEF ENGINEER"}}],"security":"COMMON STOCK","published_at":"2017-11-21T22:12:22.000Z","date":"2017-11-17","kind":"grant","acquired":true,"shares":1720,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"1,720 restricted stock units (RSUs) were awarded to the reporting person on November 17, 2017.  The RSUs become vested as to 25% of the shares on November 18, 2018, and the anniversary of that date going forward until fully vested."}],"balance_after":72385,"source":{"system":"sec-edgar","filing":"0000831641-17-000049","document":"wf-form4_151130232690861.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164117000049/wf-form4_151130232690861.xml","form_type":"4"}},{"id":4329269,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122593,"kind":"person","name":"BROWNLIE WILLIAM R","position":1,"cik":"0001346227","reported_name":"BROWNLIE WILLIAM R","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Vice President"}}],"security":"STOCK OPTION (RIGHT TO BUY)","published_at":"2017-05-09T23:03:13.000Z","date":"2017-05-08","kind":"exercise","acquired":false,"shares":16750,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option was fully exercisable on November 13, 2013."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Option expires in current year."}],"balance_after":0,"derivative":{"exercise_price":25.55,"exercise_date":"2013-11-13","expiration_date":"2017-11-13","underlying":"COMMON STOCK","underlying_shares":16750},"source":{"system":"sec-edgar","filing":"0001346227-17-000002","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000134622717000002/edgar.xml","form_type":"4"}},{"id":4329268,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122593,"kind":"person","name":"BROWNLIE WILLIAM R","position":1,"cik":"0001346227","reported_name":"BROWNLIE WILLIAM R","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Vice President"}}],"security":"COMMON STOCK","published_at":"2017-05-09T23:03:13.000Z","date":"2017-05-08","kind":"sale","acquired":false,"shares":16750,"price":46.3035,"value":775583.625,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"$46.3035 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $46.15 to $46.60."}],"balance_after":70665,"source":{"system":"sec-edgar","filing":"0001346227-17-000002","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000134622717000002/edgar.xml","form_type":"4"}},{"id":4329267,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122593,"kind":"person","name":"BROWNLIE WILLIAM R","position":1,"cik":"0001346227","reported_name":"BROWNLIE WILLIAM R","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Vice President"}}],"security":"COMMON STOCK","published_at":"2017-05-09T23:03:13.000Z","date":"2017-05-08","kind":"exercise","acquired":true,"shares":16750,"price":25.55,"value":427962.5,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"In addition to the 16,750 shares acquired in the option exercise, the reporting person acquired 192 shares of common stock pursuant to the company's Employee Stock Purchase Plan (ESPP) on December 15, 2016."}],"balance_after":87415,"source":{"system":"sec-edgar","filing":"0001346227-17-000002","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000134622717000002/edgar.xml","form_type":"4"}},{"id":4543969,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122593,"kind":"person","name":"BROWNLIE WILLIAM R","position":1,"cik":"0001346227","reported_name":"BROWNLIE WILLIAM 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person."}],"balance_after":71409,"source":{"system":"sec-edgar","filing":"0001346227-16-000014","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000134622716000014/edgar.xml","form_type":"4"}},{"id":4543966,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122593,"kind":"person","name":"BROWNLIE WILLIAM R","position":1,"cik":"0001346227","reported_name":"BROWNLIE WILLIAM R","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Vice President"}}],"security":"COMMON STOCK","published_at":"2016-11-23T21:54:05.000Z","date":"2016-11-21","kind":"tax_withholding","acquired":false,"shares":255,"price":41.25,"value":10518.75,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"255 of the shares underlying RSUs which vested on 11/21/2016 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The shares of common stock into which such vested RSUs converted are reported in Table I of this Form 4."}],"balance_after":0,"derivative":{"exercise_price":0,"exercise_date":"2016-11-16","expiration_date":"2016-11-16","underlying":"COMMON STOCK","underlying_shares":500},"source":{"system":"sec-edgar","filing":"0001346227-16-000012","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000134622716000012/edgar.xml","form_type":"4"}},{"id":4551441,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122593,"kind":"person","name":"BROWNLIE WILLIAM R","position":1,"cik":"0001346227","reported_name":"BROWNLIE WILLIAM R","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SENIOR VICE PRESIDENT"}}],"security":"COMMON STOCK","published_at":"2016-11-18T02:53:27.000Z","date":"2016-11-16","kind":"tax_withholding","acquired":false,"shares":188,"price":41.65,"value":7830.2,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"On November 16, 2016, 500 restricted stock units (RSUs) awarded in November 2012 vested.  Of the vested RSUs, 188 underlying shares were withheld to pay the related tax liability."}],"balance_after":69422,"source":{"system":"sec-edgar","filing":"0001346227-16-000012","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000134622716000012/edgar.xml","form_type":"4"}},{"id":4551440,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":122593,"kind":"person","name":"BROWNLIE WILLIAM R","position":1,"cik":"0001346227","reported_name":"BROWNLIE WILLIAM R","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SENIOR VICE PRESIDENT"}}],"security":"COMMON STOCK","published_at":"2016-11-18T02:53:27.000Z","date":"2016-11-16","kind":"exercise","acquired":true,"shares":500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents the conversion upon vesting of restricted stock units into common stock."}],"balance_after":69610,"source":{"system":"sec-edgar","filing":"0001346227-16-000012","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000134622716000012/edgar.xml","form_type":"4"}}]}