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Share-Based Compensation (Restricted Shares Activity) (Details) - Restricted Stock Units (RSUs) - $ / shares
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Shares      
Outstanding, beginning of period (in shares) 440,900 457,000.0 387,900
Granted (in shares) 151,000.0 170,800 179,700
Incremental performance shares (in shares) 42,400    
Vested and issued (in shares) (223,400) (162,300) (100,200)
Forfeited (in shares) (1,900) (24,600) (10,400)
Outstanding, end of period (in shares) 409,000.0 440,900 457,000.0
Vested, end of period (in shares) 108,500 106,800 150,400
Weighted Average Grant Date Fair Value      
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share) $ 38.45 $ 33.52 $ 33.11
Granted, weighted-average grant-date fair value (in USD per share) 55.03 45.32 40.22
Vested and issued, weighted-average grant-date fair value (in USD per share) 32.09 32.99 42.94
Forfeited, weighted-average grant-date fair value (in USD per share) 49.51 30.54 43.37
Outstanding, end of period, weighted-average grant-date fair value (in USD per share) 47.17 38.45 33.52
Vested, end of period, weighted-average grant-date fair value (in USD per share) $ 36.54 $ 36.42 $ 31.98