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Share-Based Compensation - Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) - $ / shares
 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Shares    
Outstanding, beginning of period (in shares) 440,900 457,000.0
Granted (in shares) 148,900 170,800
Incremental performance shares 42,400  
Vested (in shares) (222,400) (162,300)
Forfeited (in shares)   (24,600)
Outstanding, end of period (in shares) 409,800 440,900
Vested, end of period (in shares) 108,500 152,300
Weighted Average Grant-Date Fair Value    
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share) $ 38.45 $ 33.52
Granted, weighted-average grant-date fair value (in USD per share) 55.04 45.32
Vested, weighted-average grant-date fair value (in USD per share) 32.05 32.99
Forfeited, weighted-average grant-date fair value (in USD per share)   30.54
Outstanding, end of period, weighted-average grant-date fair value (in USD per share) 47.14 38.45
Vested, end of period, weighted-average grant-date fair value (in USD per share) $ 36.54 $ 33.92