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Earnings per Share (Tables) | 12 Months Ended
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Oct. 02, 2022
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:
| Fiscal Year Ended
| October 2, 2022 |  | October 3, 2021 |  | September 27, 2020
| (in thousands, except per share data)
Net income attributable to Tetra Tech | $ | 263,125 |  |  | $ | 232,810 |  |  | $ | 173,859 |
Weighted-average common shares outstanding – basic | 53,620 |  |  | 54,078 |  |  | 54,235 |
Effect of diluted stock options and unvested restricted stock | 543 |  |  | 597 |  |  | 787 |
Weighted-average common stock outstanding – diluted | 54,163 |  |  | 54,675 |  |  | 55,022 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |
Basic | $ | 4.91 |  |  | $ | 4.31 |  |  | $ | 3.21 |
Diluted | $ | 4.86 |  |  | $ | 4.26 |  |  | $ | 3.16 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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