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Earnings per Share ("EPS") (Tables) | 9 Months Ended
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Jun. 29, 2025
Earnings Per Share [Abstract] |
Summary of number of weighted-average shares used to compute basic and diluted EPS | The following table presents the number of weighted-average shares used to compute basic and diluted EPS (in thousands, except per share data):
| Three Months Ended |  | Nine Months Ended
| June 29, 2025 |  | June 30, 2024 |  | June 29, 2025 |  | June 30, 2024
Net income attributable to Tetra Tech | $ | 113,844 |  |  | $ | 85,810 |  |  | $ | 119,979 |  |  | $ | 237,228 |
Weighted-average common shares outstanding – basic | 263,026 |  |  | 267,575 |  |  | 265,589 |  |  | 267,255 |
Effect of dilutive stock options and unvested restricted stock | 1,829 |  |  | 2,165 |  |  | 1,900 |  |  | 2,073 |
Shares issuable assuming conversion of convertible notes | — |  |  | 520 |  |  | 624 |  |  | 175 |
Weighted-average common shares outstanding – diluted | 264,855 |  |  | 270,260 |  |  | 268,113 |  |  | 269,503 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |
Basic | $ | 0.43 |  |  | $ | 0.32 |  |  | $ | 0.45 |  |  | $ | 0.89 |
Diluted | $ | 0.43 |  |  | $ | 0.32 |  |  | $ | 0.45 |  |  | $ | 0.88 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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