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Earnings per Share (Tables) | 12 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of number of weighted-average shares used to compute basic and diluted EPS | 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 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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