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Earnings per Share ("EPS") | 9 Months Ended
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Jul. 01, 2018
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 sets forth the number of weighted-average shares used to compute basic and diluted EPS:
| Three Months Ended |  | Nine Months Ended
| July 1, 2018 |  | July 2, 2017 |  | July 1, 2018 |  | July 2, 2017
| (in thousands, except per share data)
Net income attributable to Tetra Tech | $ | 33,322 |  |  | $ | 29,983 |  |  | $ | 108,082 |  |  | $ | 83,407 |
Weighted-average common shares outstanding – basic | 55,537 |  |  | 57,184 |  |  | 55,780 |  |  | 57,108 |
Effect of dilutive stock options and unvested restricted stock | 853 |  |  | 977 |  |  | 901 |  |  | 1,008 |
Weighted-average common stock outstanding – diluted | 56,390 |  |  | 58,161 |  |  | 56,681 |  |  | 58,116 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.60 |  |  | $ | 0.52 |  |  | $ | 1.94 |  |  | $ | 1.46 |
Diluted | $ | 0.59 |  |  | $ | 0.52 |  |  | $ | 1.91 |  |  | $ | 1.44 |

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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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