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Earnings per Share ("EPS") (Tables) | 3 Months Ended
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Jan. 01, 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 |  |
| January 1, 2023 |  | January 2, 2022 |  |  |  |
Net income attributable to Tetra Tech | $ | 116,706 |  |  | $ | 68,489 |  |  |  |  |
Weighted-average common shares outstanding – basic | 53,069 |  |  | 53,937 |  |  |  |  |
Effect of dilutive stock options and unvested restricted stock | 460 |  |  | 640 |  |  |  |  |
Weighted-average common shares outstanding – diluted | 53,529 |  |  | 54,577 |  |  |  |  |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |
Basic | $ | 2.20 |  |  | $ | 1.27 |  |  |  |  |
Diluted | $ | 2.18 |  |  | $ | 1.25 |  |  |  |  |

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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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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