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Earnings per Share ("EPS") | 9 Months Ended
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Jun. 27, 2021
Earnings Per Share [Abstract] |
Earnings per Share ("EPS") | Earnings per Share (“EPS”)Basic EPS is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding, less unvested restricted stock for the period. Diluted EPS is computed by dividing net income by the weighted-average number of common shares outstanding and dilutive potential common shares for the period. Potential common shares include the weighted-average dilutive effects of outstanding stock options and unvested restricted stock using the treasury stock method. 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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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