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Earnings per Share ("EPS") | 6 Months Ended
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Mar. 29, 2020
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 |  |  |  | Six Months Ended |  |
| March 29, 2020 |  | March 31, 2019 |  | March 29, 2020 |  | March 31, 2019
| (in thousands, except per share data) |  |  |  |  |  |
Net income attributable to Tetra Tech | $ | 36,397 |  |  | $ | 55,911 |  |  | $ | 83,707 |  |  | $ | 97,907 |
Weighted-average common shares outstanding – basic | 54,699 |  |  | 55,143 |  |  | 54,541 |  |  | 55,237 |
Effect of dilutive stock options and unvested restricted stock | 764 |  |  | 842 |  |  | 839 |  |  | 924 |
Weighted-average common shares outstanding – diluted | 55,463 |  |  | 55,985 |  |  | 55,380 |  |  | 56,161 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |
Basic | $ | 0.67 |  |  | $ | 1.01 |  |  | $ | 1.53 |  |  | $ | 1.77 |
Diluted | $ | 0.66 |  |  | $ | 1.00 |  |  | $ | 1.51 |  |  | $ | 1.74 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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