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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Earnings for basic computations | $ 269,656 | $ 463,626 | $ 605,437
Weighted-average of common stock shares outstanding for basic computations (in shares) | 132,161,646 | 134,134,034 | 137,722,589
Earnings for diluted computations | $ 269,657 | $ 463,635 | $ 605,455
Dilutive stock options and restricted stock (in shares) | 554,790 | 716,774 | 980,631
Weighted-average of common stock shares outstanding for diluted computations (in shares) | 132,716,436 | 134,850,808 | 138,703,220
Earnings per share of common stock |  |  |
Basic (in dollars per share) | $ 2.04 | $ 3.46 | $ 4.40
Diluted (in dollars per share) | $ 2.03 | $ 3.44 | $ 4.37
Cash dividends paid | $ 235,726 | $ 209,057 | $ 181,066
Restricted Stock |  |  |
Earnings per share of common stock |  |  |
Unvested shares participating in the payment of the company's dividends declared (in shares) | 1,100,000 | 900,000 | 800,000
Cash dividends paid | $ 1,800 | $ 1,400 | $ 1,000
Undistributed earnings (loss) allocated to participating securities, basic | 300 | 1,700 | 2,500
Undistributed earnings (loss) allocated to participating securities, diluted | $ 300 | $ 1,700 | $ 2,500

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