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Earnings Per Share ("EPS") (Tables) | 3 Months Ended
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Dec. 31, 2017
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:
| Three Months Ended
| December 31, 2017 |  | January 1, 2017
| (in thousands, except per share data)
Net income attributable to Tetra Tech | $ | 46,034 |  |  | $ | 26,562 |
Weighted-average common shares outstanding – basic | 55,855 |  |  | 57,099 |
Effect of dilutive stock options and unvested restricted stock | 1,020 |  |  | 1,046 |
Weighted-average common stock outstanding – diluted | 56,875 |  |  | 58,145 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |
Basic | $ | 0.82 |  |  | $ | 0.47 |
Diluted | $ | 0.81 |  |  | $ | 0.46 |

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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://www.xbrl.org/2003/role/presentationRef -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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