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Earnings per Share (Tables) | 12 Months Ended
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Oct. 01, 2023
Earnings Per Share [Abstract] |
Schedule of number of weighted-average shares used to compute basic and diluted EPS | The following table sets forth the number of weighted-average shares used to compute basic and diluted EPS (in thousands, except per share data):
| Fiscal Year Ended
| October 1, 2023 |  | October 2, 2022 |  | October 3, 2021
Net income attributable to Tetra Tech | $ | 273,420 |  |  | $ | 263,125 |  |  | $ | 232,810 |
Weighted-average common shares outstanding – basic | 53,203 |  |  | 53,620 |  |  | 54,078 |
Effect of diluted stock options and unvested restricted stock | 434 |  |  | 543 |  |  | 597 |
Weighted-average common stock outstanding – diluted | 53,637 |  |  | 54,163 |  |  | 54,675 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |
Basic | $ | 5.14 |  |  | $ | 4.91 |  |  | $ | 4.31 |
Diluted | $ | 5.10 |  |  | $ | 4.86 |  |  | $ | 4.26 |

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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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