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Earnings per Share ("EPS") (Tables) | 3 Months Ended
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Dec. 31, 2023
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 |  |
| December 31, 2023 |  | January 1, 2023 |  |  |  |
Net income attributable to Tetra Tech | $ | 74,972 |  |  | $ | 116,706 |  |  |  |  |
Weighted-average common shares outstanding – basic | 53,317 |  |  | 53,069 |  |  |  |  |
Effect of dilutive stock options and unvested restricted stock | 421 |  |  | 460 |  |  |  |  |
Weighted-average common shares outstanding – diluted | 53,738 |  |  | 53,529 |  |  |  |  |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |
Basic | $ | 1.41 |  |  | $ | 2.20 |  |  |  |  |
Diluted | $ | 1.40 |  |  | $ | 2.18 |  |  |  |  |

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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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