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Revenue Recognition - Income Statement Impact of Adoption of ASC 606 (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 30, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue | $ 717,431 | $ 759,749
Income from operations | 55,711 | 48,589
Income tax (expense) benefit | 10,782 | (623)
Net income attributable to Tetra Tech | 41,997 | $ 46,034
Recognition Under Previous Guidance |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue | 715,228 |
Income from operations | 53,508 |
Income tax (expense) benefit | (10,257) |
Net income attributable to Tetra Tech | 40,319 |
Impact of the Adoption of ASC 606 | Accounting Standards Update 2014-09 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue | 2,203 |
Income from operations | 2,203 |
Income tax (expense) benefit | (525) |
Net income attributable to Tetra Tech | $ 1,678 |

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