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Earnings per Share ("EPS") | 6 Months Ended
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Mar. 31, 2019
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 31, 2019 |  | April 1, 2018 |  | March 31, 2019 |  | April 1, 2018
| (in thousands, except per share data)
Net income attributable to Tetra Tech | $ | 55,911 |  |  | $ | 28,725 |  |  | $ | 97,907 |  |  | $ | 74,759 |
Weighted-average common shares outstanding – basic | 55,143 |  |  | 55,841 |  |  | 55,237 |  |  | 55,900 |
Effect of dilutive stock options and unvested restricted stock | 842 |  |  | 832 |  |  | 924 |  |  | 925 |
Weighted-average common shares outstanding – diluted | 55,985 |  |  | 56,673 |  |  | 56,161 |  |  | 56,825 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 1.01 |  |  | $ | 0.51 |  |  | $ | 1.77 |  |  | $ | 1.34 |
Diluted | $ | 1.00 |  |  | $ | 0.51 |  |  | $ | 1.74 |  |  | $ | 1.32 |
For both the three and six months of fiscal 2019, 0.1 million options and restricted stock units were excluded from the calculation of dilutive potential common shares, compared to no options for the prior-year periods because the assumed proceeds per share exceeded the average market price per share during the periods. Therefore, their inclusion would have been anti-dilutive.

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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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