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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Earnings Per Share [Abstract] |  |  |  |
Earnings for basic computations | $ 169,277 | $ 169,543 | $ 329,428 | $ 306,933
Earnings for diluted computations | $ 169,280 | $ 169,546 | $ 329,434 | $ 306,939
Weighted-average common stock shares outstanding, basic (in shares) | 130,792,215 | 132,266,373 | 130,913,026 | 132,317,689
Dilutive stock options and restricted stock (in shares) | 340,930 | 462,872 | 424,887 | 551,452
Weighted-average common stock shares outstanding, diluted (in shares) | 131,133,145 | 132,729,245 | 131,337,913 | 132,869,141
Earnings per common share: |  |  |  |
Basic (in dollars per share) | $ 1.29 | $ 1.28 | $ 2.52 | $ 2.32
Diluted (in dollars per share) | $ 1.29 | $ 1.28 | $ 2.51 | $ 2.31
Unvested shares participating in the payment of the company's dividends declared (in shares) | 1,100,000 | 1,100,000 | 1,100,000 | 1,000,000

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