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Mergers and Acquisitions - Pro-Forma Operating Results (Details) - Coffey and INDUS - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
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Apr. 02, 2017 | Mar. 27, 2016
Mergers and Acquisitions |  |
Revenue | $ 1,332,632 | $ 1,319,281
Operating income | 82,811 | 62,766
Net income attributable to Tetra Tech | $ 53,424 | $ 39,526
Earnings per share attributable to Tetra Tech, Basic (in dollars per share) | $ 0.93 | $ 0.67
Earnings per share attributable to Tetra Tech, Diluted (in dollars per share) | $ 0.92 | $ 0.67
Revenue Contributed | $ 213,400 |
Operating income | 13,500 |
Amortization of intangible assets | $ 5,300 |

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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