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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
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Sep. 29, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Oct. 01, 2023 | Jul. 02, 2023 | Apr. 02, 2023 | Jan. 01, 2023 | Sep. 29, 2024 | Oct. 01, 2023 | Oct. 02, 2022
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,374,473 | $ 1,344,323 | $ 1,251,616 | $ 1,228,267 | $ 1,260,611 | $ 1,208,947 | $ 1,158,226 | $ 894,766 | $ 5,198,679 | $ 4,522,550 | $ 3,504,048
Income from operations | 143,343 | 128,630 | 117,683 | 111,081 | 107,377 | 97,675 | 61,011 | 92,050 | 500,737 | 358,113 | 340,446
Net income attributable to Tetra Tech | 96,154 | 85,810 | 76,446 | 74,972 | 53,649 | 60,235 | 42,830 | 116,706 | 333,382 | 273,420 | 263,125
Net income attributable to Tetra Tech | $ 96,154 | $ 85,810 | $ 76,446 | $ 74,972 | $ 53,649 | $ 60,235 | $ 42,830 | $ 116,706 | $ 333,382 | $ 273,420 | $ 263,125
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.36 | $ 0.32 | $ 0.29 | $ 0.28 | $ 0.20 | $ 0.23 | $ 0.16 | $ 0.44 | $ 1.25 | $ 1.03 | $ 0.98
Diluted (in dollars per share) | $ 0.35 | $ 0.32 | $ 0.28 | $ 0.28 | $ 0.20 | $ 0.22 | $ 0.16 | $ 0.44 | $ 1.23 | $ 1.02 | $ 0.97
Weighted-average common shares outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 267,687 | 267,575 | 267,420 | 266,585 | 266,235 | 266,155 | 266,135 | 265,345 | 267,364 | 266,015 | 268,100
Diluted (in shares) | 271,656 | 270,260 | 269,375 | 268,690 | 268,510 | 268,265 | 268,135 | 267,645 | 270,042 | 268,185 | 270,815

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482689/260-10-45-10 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration