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Earnings per Share ("EPS") (Tables) | 9 Months Ended
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Jun. 28, 2020
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 28, 2020 |  | June 30, 2019 |  | June 28, 2020 |  | June 30, 2019
| (in thousands, except per share data) |  |  |  |  |  |
Net income attributable to Tetra Tech | $ | 45,497 |  |  | $ | 49,233 |  |  | $ | 129,205 |  |  | $ | 147,141 |
Weighted-average common shares outstanding – basic | 53,985 |  |  | 54,819 |  |  | 54,366 |  |  | 55,101 |
Effect of dilutive stock options and unvested restricted stock | 707 |  |  | 949 |  |  | 795 |  |  | 933 |
Weighted-average common shares outstanding – diluted | 54,692 |  |  | 55,768 |  |  | 55,161 |  |  | 56,034 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |
Basic | $ | 0.84 |  |  | $ | 0.90 |  |  | $ | 2.38 |  |  | $ | 2.67 |
Diluted | $ | 0.83 |  |  | $ | 0.88 |  |  | $ | 2.34 |  |  | $ | 2.63 |

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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=6371337&loc=d3e3550-109257 + Details
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