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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share [Abstract]        
Earnings for basic computations $ 387,779 $ 169,277 $ 552,345 $ 329,428
Earnings for diluted computations $ 387,786 $ 169,280 $ 552,353 $ 329,434
Weighted-average common stock shares outstanding, basic (in shares) 128,391,878 130,792,215 128,893,263 130,913,026
Dilutive stock options and restricted stock (in shares) 456,199 340,930 494,459 424,887
Weighted-average common stock shares outstanding, diluted (in shares) 128,848,077 131,133,145 129,387,722 131,337,913
Earnings per common share:        
Basic (in dollars per share) $ 3.02 $ 1.29 $ 4.29 $ 2.52
Diluted (in dollars per share) $ 3.01 $ 1.29 $ 4.27 $ 2.51
Unvested shares participating in the payment of the company's dividends declared (in shares) 800,000 1,100,000 700,000 1,100,000