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Quarterly Financial Information - Unaudited (Tables) | 12 Months Ended
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Oct. 03, 2021
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 2021 |  |  |  |  |  |  |
Revenue | $ | 765,104 |  |  | $ | 754,764 |  |  | $ | 801,633 |  |  | $ | 892,012 |
Income from operations | 66,252 |  |  | 60,807 |  |  | 69,807 |  |  | 81,836 |
Net income attributable to Tetra Tech | 52,436 |  |  | 45,517 |  |  | 51,903 |  |  | 82,954 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |
Basic | $ | 0.97 |  |  | $ | 0.84 |  |  | $ | 0.96 |  |  | $ | 1.54 |
Diluted | $ | 0.96 |  |  | $ | 0.83 |  |  | $ | 0.95 |  |  | $ | 1.52 |
Weighted-average common shares outstanding: |  |  |  |  |  |  |
Basic | 53,927 |  |  | 54,187 |  |  | 54,117 |  |  | 54,019 |
Diluted | 54,637 |  |  | 54,736 |  |  | 54,666 |  |  | 54,597 |
Fiscal Year 2020 |  |  |  |  |  |  |
Revenue | $ | 797,623 |  |  | $ | 734,133 |  |  | $ | 709,771 |  |  | $ | 753,364 |
Income from operations | 63,302 |  |  | 47,530 |  |  | 63,525 |  |  | 66,735 |
Net income attributable to Tetra Tech | 47,310 |  |  | 36,397 |  |  | 45,497 |  |  | 44,654 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |
Basic | $ | 0.87 |  |  | $ | 0.67 |  |  | $ | 0.84 |  |  | $ | 0.83 |
Diluted | $ | 0.85 |  |  | $ | 0.66 |  |  | $ | 0.83 |  |  | $ | 0.82 |
Weighted-average common shares outstanding: |  |  |  |  |  |  |
Basic | 54,560 |  |  | 54,699 |  |  | 53,985 |  |  | 53,841 |
Diluted | 55,438 |  |  | 55,463 |  |  | 54,692 |  |  | 54,603 |

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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=124502072&loc=d3e1280-108306 + Details
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