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Quarterly Financial Information – Unaudited - Summary of Quarterly Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 01, 2023 | Jul. 02, 2023 | Apr. 02, 2023 | Jan. 01, 2023 | Oct. 02, 2022 | Jul. 03, 2022 | Apr. 03, 2022 | Jan. 02, 2022 | Oct. 01, 2023 | Oct. 02, 2022 | Oct. 03, 2021
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,260,611 | $ 1,208,947 | $ 1,158,226 | $ 894,766 | $ 902,562 | $ 890,231 | $ 852,744 | $ 858,510 | $ 4,522,550 | $ 3,504,048 | $ 3,213,513
Income from operations | 107,377 | 97,675 | 61,011 | 92,050 | 94,802 | 83,905 | 74,520 | 87,220 | 358,113 | 340,446 | 278,701
Net income attributable to Tetra Tech | 53,649 | 60,235 | 42,830 | 116,706 | 82,947 | 58,650 | 53,040 | 68,489 | 273,420 | 263,125 | 232,810
Net income attributable to Tetra Tech | $ 53,649 | $ 60,235 | $ 42,830 | $ 116,706 | $ 82,947 | $ 58,650 | $ 53,040 | $ 68,489 | $ 273,420 | $ 263,125 | $ 232,810
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 1.01 | $ 1.13 | $ 0.80 | $ 2.20 | $ 1.56 | $ 1.10 | $ 0.99 | $ 1.27 | $ 5.14 | $ 4.91 | $ 4.31
Diluted (in dollars per share) | $ 1.00 | $ 1.12 | $ 0.80 | $ 2.18 | $ 1.55 | $ 1.09 | $ 0.98 | $ 1.25 | $ 5.10 | $ 4.86 | $ 4.26
Weighted-average common shares outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 53,247 | 53,231 | 53,227 | 53,069 | 53,148 | 53,507 | 53,834 | 53,937 | 53,203 | 53,620 | 54,078
Diluted (in shares) | 53,702 | 53,653 | 53,627 | 53,529 | 53,667 | 54,006 | 54,346 | 54,577 | 53,637 | 54,163 | 54,675

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