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Earnings per Share | 12 Months Ended
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Sep. 28, 2025
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 common shares outstanding 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 20 25 and fiscal 2024, our Convertible Notes, described in Note 9, "Long-Term Debt", had a dilution impact on the dilutive potential common shares, wh ich was calculated using the if-converted method. The dilution impact was due to the price of our common stock exceeding the conversion price. The relat ed Capped Call Transactions were excluded from the calculation of dilutive potential common shares as their effect is anti-dilutive. For fiscal 2025, 2024 and 2023, 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 28, 2025 |  | September 29, 2024 |  | October 1, 2023
Net income attributable to Tetra Tech | $ | 247,724 |  |  | $ | 333,382 |  |  | $ | 273,420 |
Weighted-average common shares outstanding – basic | 264,713 |  |  | 267,364 |  |  | 266,015 |
Effect of diluted stock options and unvested restricted stock | 1,942 |  |  | 2,125 |  |  | 2,170 |
Shares issuable assuming conversion of convertible notes | 468 |  |  | 553 |  |  | — |
Weighted-average common stock outstanding – diluted | 267,123 |  |  | 270,042 |  |  | 268,185 |
Earnings per share attributable to Tetra Tech: |  |  |  |  |
Basic | $ | 0.94 |  |  | $ | 1.25 |  |  | $ | 1.03 |
Diluted | $ | 0.93 |  |  | $ | 1.23 |  |  | $ | 1.02 |

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