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Earnings per Share ("EPS") (Tables) | 9 Months Ended
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Jul. 02, 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 |  | Nine Months Ended
| July 2, 2023 |  | July 3, 2022 |  | July 2, 2023 |  | July 3, 2022
Net income attributable to Tetra Tech | $ | 60,235 |  |  | $ | 58,650 |  |  | $ | 219,771 |  |  | $ | 180,179 |
Weighted-average common shares outstanding – basic | 53,231 |  |  | 53,507 |  |  | 53,188 |  |  | 53,777 |
Effect of dilutive stock options and unvested restricted stock | 422 |  |  | 499 |  |  | 427 |  |  | 551 |
Weighted-average common shares outstanding – diluted | 53,653 |  |  | 54,006 |  |  | 53,615 |  |  | 54,328 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |
Basic | $ | 1.13 |  |  | $ | 1.10 |  |  | $ | 4.13 |  |  | $ | 3.35 |
Diluted | $ | 1.12 |  |  | $ | 1.09 |  |  | $ | 4.10 |  |  | $ | 3.32 |

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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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