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Stock-Based Compensation - Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) - $ / shares
 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Shares    
Outstanding, beginning of period (in shares) 409,000.0 440,900
Granted (in shares) 157,100 148,900
Incremental performance shares (in shares) 41,400 42,400
Vested (in shares) (205,000.0) (222,400)
Forfeited (in shares) (8,600)  
Outstanding, end of period (in shares) 393,900 409,800
Vested, end of period (in shares) 110,200 108,500
Weighted Average Grant-Date Fair Value    
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share) $ 47.17 $ 38.45
Granted, weighted-average grant-date fair value (in USD per share) 62.06 55.04
Vested, weighted-average grant-date fair value (in USD per share) 43.17 32.05
Forfeited, weighted-average grant-date fair value (in USD per share) 53.72  
Outstanding, end of period, weighted-average grant-date fair value (in USD per share) 54.40 47.14
Vested, end of period, weighted-average grant-date fair value (in USD per share) $ 38.77 $ 36.54