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Earnings per Share | 12 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Earnings per Share | Earnings per Share The following table sets forth the number of weighted-average shares used to compute basic and diluted EPS:
| Fiscal Year Ended
| September 30, 2018 |  | October 1, 2017 |  | October 2, 2016
| (in thousands, except per share data)
Net income attributable to Tetra Tech | $ | 136,883 |  |  | $ | 117,874 |  |  | $ | 83,783 |
Weighted-average common shares outstanding – basic | 55,670 |  |  | 56,911 |  |  | 58,186 |
Effect of diluted stock options and unvested restricted stock | 928 |  |  | 1,002 |  |  | 780 |
Weighted-average common stock outstanding – diluted | 56,598 |  |  | 57,913 |  |  | 58,966 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |  |
Basic | $ | 2.46 |  |  | $ | 2.07 |  |  | $ | 1.44 |
Diluted | $ | 2.42 |  |  | $ | 2.04 |  |  | $ | 1.42 |
For fiscal 2018, 0.1 million options were excluded from the calculation of dilutive potential common shares. For fiscal 2017 and 2016, no options were excluded from the calculation of dilutive potential common shares. These options were not included in the computation of dilutive potential common shares because the assumed proceeds per share exceeded the average market price per share for that period. 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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