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Earnings per Share ("EPS") (Tables) | 9 Months Ended
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Jul. 01, 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:
| 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 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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