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Earnings per Share ("EPS") (Tables) | 6 Months Ended
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Mar. 30, 2025
Earnings Per Share [Abstract] |
Schedule 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 |  | Six Months Ended
| March 30, 2025 |  | March 31, 2024 |  | March 30, 2025 |  | March 31, 2024
Net income attributable to Tetra Tech | $ | 5,388 |  |  | $ | 76,446 |  |  | $ | 6,135 |  |  | $ | 151,418 |
Weighted-average common shares outstanding – basic | 265,728 |  |  | 267,420 |  |  | 266,819 |  |  | 267,095 |
Effect of dilutive stock options and unvested restricted stock | 1,711 |  |  | 1,955 |  |  | 1,936 |  |  | 2,030 |
Shares issuable assuming conversion of convertible notes | — |  |  | — |  |  | 936 |  |  | $ | — |
Weighted-average common shares outstanding – diluted | 267,439 |  |  | 269,375 |  |  | 269,691 |  |  | 269,125 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |
Basic | $ | 0.02 |  |  | $ | 0.29 |  |  | $ | 0.02 |  |  | $ | 0.57 |
Diluted | $ | 0.02 |  |  | $ | 0.28 |  |  | $ | 0.02 |  |  | $ | 0.56 |

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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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