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Earnings per Share ("EPS") (Tables) | 6 Months Ended
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Mar. 31, 2024
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 31, 2024 |  | April 2, 2023 |  | March 31, 2024 |  | April 2, 2023
Net income attributable to Tetra Tech | $ | 76,446 |  |  | $ | 42,830 |  |  | $ | 151,418 |  |  | $ | 159,536 |
Weighted-average common shares outstanding – basic | 53,484 |  |  | 53,227 |  |  | 53,419 |  |  | 53,165 |
Effect of dilutive stock options and unvested restricted stock | 391 |  |  | 400 |  |  | 406 |  |  | 430 |
Weighted-average common shares outstanding – diluted | 53,875 |  |  | 53,627 |  |  | 53,825 |  |  | 53,595 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |
Basic | $ | 1.43 |  |  | $ | 0.80 |  |  | $ | 2.83 |  |  | $ | 3.00 |
Diluted | $ | 1.42 |  |  | $ | 0.80 |  |  | $ | 2.81 |  |  | $ | 2.98 |

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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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