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Earnings per Share ("EPS") | 3 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Earnings per Share ("EPS") | Earnings per Share (“EPS”) 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 outstanding stock options and unvested restricted stock using the treasury stock method. The following table presents the number of weighted-average shares used to compute basic and diluted EPS (in thousands, except per share data):
| Three Months Ended |  |
| December 31, 2023 |  | January 1, 2023 |  |  |  |
Net income attributable to Tetra Tech | $ | 74,972 |  |  | $ | 116,706 |  |  |  |  |
Weighted-average common shares outstanding – basic | 53,317 |  |  | 53,069 |  |  |  |  |
Effect of dilutive stock options and unvested restricted stock | 421 |  |  | 460 |  |  |  |  |
Weighted-average common shares outstanding – diluted | 53,738 |  |  | 53,529 |  |  |  |  |
Earnings per share attributable to Tetra Tech: |  |  |  |  |  |  |
Basic | $ | 1.41 |  |  | $ | 2.20 |  |  |  |  |
Diluted | $ | 1.40 |  |  | $ | 2.18 |  |  |  |  |
For the first quarters of fiscal 2024 and 2023, no options were excluded from the calculation of dilutive potential common shares. The Convertible Notes described in Note 14 "Long-Term Debt", had no impact on the calculation of dilutive potential common shares in the first quarter of fiscal 2024, as the price of our common stock did not exceed the conversion price. The Capped Call Transactions were excluded from the calculation of dilutive potential common shares as their effect is anti-dilutive.

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