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Earnings per Share ("EPS") (Tables) | 6 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Schedule of number of weighted-average shares used to compute basic and diluted EPS | 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 |

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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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