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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
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