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Quarterly Financial Information – Unaudited | 12 Months Ended
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Sep. 28, 2025
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information – Unaudited | Quarterly Financial Information – Unaudited In the opinion of management, the followin g unaudited quarte rly data for the fiscal 2025 and 2024 reflect all adjustments necessary for a fair statement of the results of operations (in thousands, except per share data).
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Fiscal Year 2025 |  |  |  |  |  |  |
Revenue | $ | 1,420,561 |  |  | $ | 1,322,113 |  |  | $ | 1,369,816 |  |  | $ | 1,330,100 |
Income from operations | 22,526 |  |  | 39,603 |  |  | 164,986 |  |  | 181,304 |
Net income attributable to Tetra Tech | 747 |  |  | 5,388 |  |  | 113,844 |  |  | 127,745 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |
Basic | $ | — |  |  | $ | 0.02 |  |  | $ | 0.43 |  |  | $ | 0.49 |
Diluted | $ | — |  |  | $ | 0.02 |  |  | $ | 0.43 |  |  | $ | 0.48 |
Weighted-average common shares outstanding: |  |  |  |  |  |  |
Basic | 267,854 |  |  | 265,728 |  |  | 263,026 |  |  | 262,184 |
Diluted | 271,886 |  |  | 267,439 |  |  | 264,855 |  |  | 264,247 |
Fiscal Year 2024 |  |  |  |  |  |  |
Revenue | $ | 1,228,267 |  |  | $ | 1,251,616 |  |  | $ | 1,344,323 |  |  | $ | 1,374,473 |
Income from operations | 111,081 |  |  | 117,683 |  |  | 128,630 |  |  | 143,343 |
Net income attributable to Tetra Tech | 74,972 |  |  | 76,446 |  |  | 85,810 |  |  | 96,154 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |
Basic | $ | 0.28 |  |  | $ | 0.29 |  |  | $ | 0.32 |  |  | $ | 0.36 |
Diluted | $ | 0.28 |  |  | $ | 0.28 |  |  | $ | 0.32 |  |  | $ | 0.35 |
Weighted-average common shares outstanding: |  |  |  |  |  |  |
Basic | 266,585 |  |  | 267,420 |  |  | 267,575 |  |  | 267,687 |
Diluted | 268,690 |  |  | 269,375 |  |  | 270,260 |  |  | 271,656 |

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1B Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 270 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/270/tableOfContent + Details
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