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Earnings per Share | 12 Months Ended
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Sep. 29, 2024
Earnings Per Share [Abstract] |
Earnings per Share | Earnings per Share Basic EPS is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding, less unvested restricted stock for the period. Diluted EPS is computed by dividing net income by the weighted-average number of common shares outstanding and dilutive potential common shares for the period. Potential common shares include the weighted-average dilutive effects of stock-based awards and shares underlying our Convertible Notes. For fiscal 2024, our Convertible Notes, described in Note 9, "Long-Term Debt", had a dilution impact on the dilutive potential common shares, which was calculated using the if-converted method. The dilution impact was due to the price of our common stock exceeding the conversion price. The related Capped Call Transactions were excluded from the calculation of dilutive potential common shares as their effect is anti-dilutive. For fiscal 2024, 2023 and 2022, no options were excluded from the calculation of dilutive potential common shares. The following table presents the number of weighted-average shares used to compute basic and diluted EPS (in thousands, except per share data):
| Fiscal Year Ended
| September 29, 2024 |  | October 1, 2023 |  | October 2, 2022
Net income attributable to Tetra Tech | $ | 333,382 |  |  | $ | 273,420 |  |  | $ | 263,125 |
Weighted-average common shares outstanding – basic | 267,364 |  |  | 266,015 |  |  | 268,100 |
Effect of diluted stock options and unvested restricted stock | 2,125 |  |  | 2,170 |  |  | 2,715 |
Shares issuable assuming conversion of convertible notes | 553 |  |  | — |  |  | — |
Weighted-average common stock outstanding – diluted | 270,042 |  |  | 268,185 |  |  | 270,815 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |
Basic | $ | 1.25 |  |  | $ | 1.03 |  |  | $ | 0.98 |
Diluted | $ | 1.23 |  |  | $ | 1.02 |  |  | $ | 0.97 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/260/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-3 + Details
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