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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.  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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 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 3,078 PSUs awarded on November 21, 2014 were earned and vested on November 21, 2017."}],"balance_after":31915,"source":{"system":"sec-edgar","filing":"0000831641-17-000103","document":"wf-form4_151138590530089.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164117000103/wf-form4_151138590530089.xml","form_type":"4"}},{"id":4155418,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":170157,"kind":"person","name":"SALIN JANIS B","position":1,"cik":"0001206392","reported_name":"SALIN JANIS B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, GENERAL COUNSEL"}}],"security":"COMMON STOCK","published_at":"2017-11-21T22:16:11.000Z","date":"2017-11-20","kind":"tax_withholding","acquired":false,"shares":323,"price":48.55,"value":15681.65,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"323 of the shares underlying restricted stock which vested on 11/20/2017 were withheld to pay the related tax liability."}],"balance_after":25759,"source":{"system":"sec-edgar","filing":"0000831641-17-000061","document":"wf-form4_151130255772674.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164117000061/wf-form4_151130255772674.xml","form_type":"4"}},{"id":4155417,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":170157,"kind":"person","name":"SALIN JANIS B","position":1,"cik":"0001206392","reported_name":"SALIN JANIS B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, GENERAL COUNSEL"}}],"security":"COMMON STOCK","published_at":"2017-11-21T22:16:11.000Z","date":"2017-11-18","kind":"tax_withholding","acquired":false,"shares":215,"price":47.95,"value":10309.25,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"215 of the shares underlying restricted stock which vested on 11/18/2017 were withheld to pay the related tax liability."}],"balance_after":26082,"source":{"system":"sec-edgar","filing":"0000831641-17-000061","document":"wf-form4_151130255772674.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/831641/000083164117000061/wf-form4_151130255772674.xml","form_type":"4"}},{"id":4329191,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":170157,"kind":"person","name":"SALIN JANIS B","position":1,"cik":"0001206392","reported_name":"SALIN JANIS B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP and General Counsel"}}],"security":"COMMON STOCK","published_at":"2017-05-09T23:09:14.000Z","date":"2017-05-08","kind":"disposition_to_issuer","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":"The option expires in the 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":"0001206392-17-000002","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/831641/000120639217000002/edgar.xml","form_type":"4"}},{"id":4329190,"issuer":{"id":3570,"kind":"organization","name":"TETRA TECH INC"},"owners":[{"id":170157,"kind":"person","name":"SALIN JANIS B","position":1,"cik":"0001206392","reported_name":"SALIN JANIS B","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP and General Counsel"}}],"security":"COMMON STOCK","published_at":"2017-05-09T23:09:14.000Z","date":"2017-05-08","kind":"sale","acquired":false,"shares":16750,"price":46.4646,"value":778282.05,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"$46.4646 is a weighted average price.  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