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Share-Based Compensation (Restricted Shares Activity) (Details) - Restricted Stock Units (RSUs) - $ / shares
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Shares      
Outstanding, beginning of period (in shares) 409,000.0 440,900 457,000.0
Granted (in shares) 157,100 151,000.0 170,800
Incremental performance shares (in shares) 41,400 42,400  
Vested and issued (in shares) (205,000.0) (223,400) (162,300)
Forfeited (in shares) (10,600) (1,900) (24,600)
Outstanding, end of period (in shares) 391,900 409,000.0 440,900
Vested, end of period (in shares) 110,200 108,500 106,800
Weighted Average Grant Date Fair Value      
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share) $ 47.17 $ 38.45 $ 33.52
Granted, weighted-average grant-date fair value (in USD per share) 62.06 55.03 45.32
Vested and issued, weighted-average grant-date fair value (in USD per share) 43.17 32.09 32.99
Forfeited, weighted-average grant-date fair value (in USD per share) 52.68 49.51 30.54
Outstanding, end of period, weighted-average grant-date fair value (in USD per share) 54.43 47.17 38.45
Vested, end of period, weighted-average grant-date fair value (in USD per share) $ 38.77 $ 36.54 $ 36.42