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Earnings per Share ("EPS") (Tables) | 9 Months Ended
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Jun. 27, 2021
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:
| Three Months Ended |  | Nine Months Ended
| June 27, 2021 |  | June 28, 2020 |  | June 27, 2021 |  | June 28, 2020
| (in thousands, except per share data)
Net income attributable to Tetra Tech | $ | 51,903 |  |  | $ | 45,497 |  |  | $ | 149,856 |  |  | $ | 129,205 |
Weighted-average common shares outstanding – basic | 54,117 |  |  | 53,985 |  |  | 54,095 |  |  | 54,366 |
Effect of dilutive stock options and unvested restricted stock | 549 |  |  | 707 |  |  | 603 |  |  | 795 |
Weighted-average common shares outstanding – diluted | 54,666 |  |  | 54,692 |  |  | 54,698 |  |  | 55,161 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |
Basic | $ | 0.96 |  |  | $ | 0.84 |  |  | $ | 2.77 |  |  | $ | 2.38 |
Diluted | $ | 0.95 |  |  | $ | 0.83 |  |  | $ | 2.74 |  |  | $ | 2.34 |

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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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