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Quarterly Financial Information-Unaudited (Tables) | 12 Months Ended
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Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract] |
Schedule of unaudited quarterly data |
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
| (in thousands, except per share data)
Fiscal Year 2018 |  |  |  |  |  |  |  |  |  |  |
Revenue | $ | 759,749 |  |  | $ | 700,262 |  |  | $ | 764,795 |  |  | $ | 739,343 |
Income from operations | 48,589 |  |  | 42,716 |  |  | 55,496 |  |  | 43,285 |
Net income attributable to Tetra Tech | 46,034 |  |  | 28,725 |  |  | 33,322 |  |  | 28,802 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.82 |  |  | $ | 0.51 |  |  | $ | 0.60 |  |  | $ | 0.52 |
Diluted | $ | 0.81 |  |  | $ | 0.51 |  |  | $ | 0.59 |  |  | $ | 0.51 |
Weighted-average common shares outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic | 55,855 |  |  | 55,841 |  |  | 55,537 |  |  | 55,341 |
Diluted | 56,875 |  |  | 56,673 |  |  | 56,390 |  |  | 56,349 |
Fiscal Year 2017 |  |  |  |  |  |  |  |  |  |  |
Revenue | $ | 668,851 |  |  | $ | 663,781 |  |  | $ | 685,539 |  |  | $ | 735,188 |
Income from operations | 39,855 |  |  | 42,956 |  |  | 45,884 |  |  | 54,647 |
Net income attributable to Tetra Tech | 26,562 |  |  | 26,862 |  |  | 29,983 |  |  | 34,467 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.47 |  |  | $ | 0.47 |  |  | $ | 0.52 |  |  | $ | 0.61 |
Diluted | $ | 0.46 |  |  | $ | 0.46 |  |  | $ | 0.52 |  |  | $ | 0.60 |
Weighted-average common shares outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic | 57,099 |  |  | 57,270 |  |  | 57,184 |  |  | 56,338 |
Diluted | 58,145 |  |  | 58,270 |  |  | 58,161 |  |  | 57,326 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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