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Revenue Recognition - Income Statement Impact of Adoption of ASC 606 (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 29, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 30, 2018 | Sep. 30, 2018 | Jul. 01, 2018 | Apr. 01, 2018 | Dec. 31, 2017 | Sep. 29, 2019 | Sep. 30, 2018 | Oct. 01, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 3,107,348 | $ 2,964,148 | $ 2,753,360
Income from operations | $ 20,665 | $ 64,841 | $ 47,545 | $ 55,711 | $ 43,285 | $ 55,496 | $ 42,716 | $ 48,589 | 188,762 | 190,086 | 183,342
Income tax expense |  |  |  |  |  |  |  |  | (16,375) | (37,605) | (53,844)
Net income attributable to Tetra Tech | $ 11,527 | $ 49,233 | $ 55,911 | $ 41,997 | $ 28,802 | $ 33,322 | $ 28,725 | $ 46,034 | 158,668 | $ 136,883 | $ 117,874
Recognition Under Previous Guidance |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,105,621 |  |
Income from operations |  |  |  |  |  |  |  |  | 187,035 |  |
Income tax expense |  |  |  |  |  |  |  |  | (15,874) |  |
Net income attributable to Tetra Tech |  |  |  |  |  |  |  |  | 157,442 |  |
Impact of the Adoption of ASC 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,727 |  |
Income from operations |  |  |  |  |  |  |  |  | 1,727 |  |
Income tax expense |  |  |  |  |  |  |  |  | (501) |  |
Net income attributable to Tetra Tech |  |  |  |  |  |  |  |  | $ 1,226 |  |

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