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Share-Based Compensation (Restricted Shares Activity) (Details) - Restricted Stock Units (RSUs) - $ / shares
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Shares      
Outstanding, beginning of period (in shares) 391,900 409,000.0 440,900
Granted (in shares) 166,800 157,100 151,000.0
Incremental performance shares (in shares) 41,100 41,400 42,400
Vested (in shares) (192,700) (205,000.0) (223,400)
Forfeited (in shares) (4,900) (10,600) (1,900)
Outstanding, end of period (in shares) 402,200 391,900 409,000.0
Vested, end of period (in shares) 97,600 110,200 108,500
Weighted Average Grant Date Fair Value      
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share) $ 54.43 $ 47.17 $ 38.45
Granted, weighted-average grant-date fair value (in USD per share) 70.31 62.06 55.03
Vested and issued, weighted-average grant-date fair value (in USD per share) 47.60 43.17 32.09
Forfeited, weighted-average grant-date fair value (in USD per share) 59.31 52.68 49.51
Outstanding, end of period, weighted-average grant-date fair value (in USD per share) 63.20 54.43 47.17
Vested, end of period, weighted-average grant-date fair value (in USD per share) $ 39.90 $ 38.77 $ 36.54