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The PSUs awarded cliff-vest after a 3-year performance period.  The Performance Period was the Company's fiscal years 2015, 2016 and 2017.  The number of PSUs earned by the Awardee for the Performance Period was determined at the end of the Performance Period by measuring relative total shareholder return (\"TSR\"), with equal weight given to the selected industry peer group and to the S&P 1000.  The TSR peer group performance percentile was 89%, and the TSR S&P 1000 performance percentile was 82%.  Straight line interpolation determined the vesting credit percentage.  Therefore, 189% of the 900 PSUs awarded on November 21, 2014 were earned and vested on November 21, 2017."}],"balance_after":17621,"source":{"system":"sec-edgar","filing":"0000831641-17-000096","document":"wf-form4_151138578234682.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164117000096/wf-form4_151138578234682.xml","form_type":"4"}},{"id":4153410,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":151386,"kind":"person","name":"GRANT HUGH M","position":1,"cik":"0001215373","reported_name":"GRANT HUGH M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"COMMON STOCK","published_at":"2017-11-22T21:23:16.000Z","date":"2017-11-21","kind":"grant","acquired":true,"shares":1800,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each performance share unit (\"PSU\") represents the right to receive one share of Common Stock.  The PSUs awarded cliff-vest after a 3-year performance period.  The Performance Period was the Company's fiscal years 2015, 2016 and 2017.  The number of PSUs earned by the Awardee was determined at the end of the Performance Period by measuring earnings per share (\"EPS\") growth, which was  35% year-over-year growth.  Therefore, 200% of the 900 PSUs awarded on November 21, 2014 were earned and vested on November 21, 2017."}],"balance_after":15920,"source":{"system":"sec-edgar","filing":"0000831641-17-000096","document":"wf-form4_151138578234682.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164117000096/wf-form4_151138578234682.xml","form_type":"4"}},{"id":4155404,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":151386,"kind":"person","name":"GRANT HUGH M","position":1,"cik":"0001215373","reported_name":"GRANT HUGH M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"STOCK OPTION (RIGHT TO BUY)","published_at":"2017-11-21T22:13:40.000Z","date":"2017-11-17","kind":"grant","acquired":true,"shares":4200,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The option becomes exercisable as to 100% of the shares on the anniversary of the grant date."}],"balance_after":4200,"derivative":{"exercise_price":47.95,"exercise_date":"2018-11-17","expiration_date":"2027-11-17","underlying":"COMMON STOCK","underlying_shares":4200},"source":{"system":"sec-edgar","filing":"0000831641-17-000053","document":"wf-form4_151130240720495.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164117000053/wf-form4_151130240720495.xml","form_type":"4"}},{"id":4155403,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":151386,"kind":"person","name":"GRANT HUGH M","position":1,"cik":"0001215373","reported_name":"GRANT HUGH M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"COMMON STOCK","published_at":"2017-11-21T22:13:40.000Z","date":"2017-11-17","kind":"grant","acquired":true,"shares":900,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"900 restricted stock units (RSUs) were awarded to the reporting person on November 17, 2017.  The RSUs will become vested as to 100% of the shares on November 18, 2018."}],"balance_after":14120,"source":{"system":"sec-edgar","filing":"0000831641-17-000053","document":"wf-form4_151130240720495.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164117000053/wf-form4_151130240720495.xml","form_type":"4"}},{"id":4458223,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":151386,"kind":"person","name":"GRANT HUGH M","position":1,"cik":"0001215373","reported_name":"GRANT HUGH M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"STOCK OPTION (RIGHT TO BUY)","published_at":"2017-02-10T22:19:29.000Z","date":"2017-02-09","kind":"exercise","acquired":false,"shares":8000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option was fully exercisable on March 1, 2008."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The option expires in the current year."}],"balance_after":0,"derivative":{"exercise_price":17.74,"exercise_date":"2008-03-01","expiration_date":"2017-03-02","underlying":"COMMON STOCK","underlying_shares":8000},"source":{"system":"sec-edgar","filing":"0001215373-17-000002","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000121537317000002/edgar.xml","form_type":"4"}},{"id":4458222,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":151386,"kind":"person","name":"GRANT HUGH M","position":1,"cik":"0001215373","reported_name":"GRANT HUGH M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"COMMON STOCK","published_at":"2017-02-10T22:19:29.000Z","date":"2017-02-09","kind":"sale","acquired":false,"shares":8000,"price":41.4731,"value":331784.8,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"$41.4731 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $41.40 to $41.55."}],"balance_after":13220,"source":{"system":"sec-edgar","filing":"0001215373-17-000002","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000121537317000002/edgar.xml","form_type":"4"}},{"id":4458221,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":151386,"kind":"person","name":"GRANT HUGH M","position":1,"cik":"0001215373","reported_name":"GRANT HUGH M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"COMMON STOCK","published_at":"2017-02-10T22:19:29.000Z","date":"2017-02-09","kind":"exercise","acquired":true,"shares":8000,"price":17.74,"value":141920.0,"ownership":{"direct":true},"balance_after":21220,"source":{"system":"sec-edgar","filing":"0001215373-17-000002","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000121537317000002/edgar.xml","form_type":"4"}},{"id":4545995,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":151386,"kind":"person","name":"GRANT HUGH M","position":1,"cik":"0001215373","reported_name":"GRANT HUGH M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"STOCK OPTION (RIGHT TO BUY)","published_at":"2016-11-22T22:36:02.000Z","date":"2016-11-18","kind":"grant","acquired":true,"shares":4200,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option becomes exercisable as to 100% of the shares on the anniversary of the grant date."}],"balance_after":4200,"derivative":{"exercise_price":40.8,"exercise_date":"2016-11-20","expiration_date":"2025-11-20","underlying":"COMMON STOCK","underlying_shares":4200},"source":{"system":"sec-edgar","filing":"0001215373-16-000011","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000121537316000011/edgar.xml","form_type":"4"}},{"id":4545994,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":151386,"kind":"person","name":"GRANT HUGH M","position":1,"cik":"0001215373","reported_name":"GRANT HUGH M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"COMMON STOCK","published_at":"2016-11-22T22:36:02.000Z","date":"2016-11-22","kind":"grant","acquired":true,"shares":240,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"In accordance with our compensation policy for Directors, 140% of the applicable restricted stock installment granted on 11/22/2013 became vested on 11/22/2016, and 240 additional shares were issued to the reporting person."}],"balance_after":13220,"source":{"system":"sec-edgar","filing":"0001215373-16-000011","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000121537316000011/edgar.xml","form_type":"4"}},{"id":4545993,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":151386,"kind":"person","name":"GRANT HUGH M","position":1,"cik":"0001215373","reported_name":"GRANT HUGH M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"COMMON STOCK","published_at":"2016-11-22T22:36:02.000Z","date":"2016-11-18","kind":"grant","acquired":true,"shares":900,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"900 restricted stock units (RSUs) were awarded to the reporting person on November 18, 2016.  The RSUs will become vested as to 100% of the shares on the anniversary of the grant date."}],"balance_after":12980,"source":{"system":"sec-edgar","filing":"0001215373-16-000011","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000121537316000011/edgar.xml","form_type":"4"}},{"id":4551408,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":151386,"kind":"person","name":"GRANT HUGH M","position":1,"cik":"0001215373","reported_name":"GRANT HUGH M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"RESTRICTED STOCK UNITS","published_at":"2016-11-18T02:32:35.000Z","date":"2016-11-16","kind":"exercise","acquired":false,"shares":225,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On November 16, 2016, 225 restricted stock units (RSUs) awarded in November 2012 vested.  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":225},"source":{"system":"sec-edgar","filing":"0001215373-16-000009","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000121537316000009/edgar.xml","form_type":"4"}},{"id":4551407,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":151386,"kind":"person","name":"GRANT HUGH M","position":1,"cik":"0001215373","reported_name":"GRANT HUGH M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"COMMON STOCK","published_at":"2016-11-18T02:32:35.000Z","date":"2016-11-16","kind":"exercise","acquired":true,"shares":225,"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":12080,"source":{"system":"sec-edgar","filing":"0001215373-16-000009","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000121537316000009/edgar.xml","form_type":"4"}}]}