v3.26.1
Share-Based Compensation (Restricted Shares Activity) (Details) - Restricted Stock Units (RSUs) - $ / shares
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Shares      
Outstanding, beginning of period (in shares) 402,200 391,900 409,000.0
Granted (in shares) 138,100 166,800 157,100
Incremental performance shares (in shares)   41,100 41,400
Vested (in shares) (133,400) (192,700) (205,000.0)
Forfeited (in shares) (27,800) (4,900) (10,600)
Outstanding, end of period (in shares) 379,100 402,200 391,900
Vested, end of period (in shares) 110,200 97,600 110,200
Weighted Average Grant Date Fair Value      
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share) $ 63.20 $ 54.43 $ 47.17
Granted, weighted-average grant-date fair value (in USD per share) 80.66 70.31 62.06
Vested and issued, weighted-average grant-date fair value (in USD per share) 57.76 47.60 43.17
Forfeited, weighted-average grant-date fair value (in USD per share) 65.00 59.31 52.68
Outstanding, end of period, weighted-average grant-date fair value (in USD per share) 71.34 63.20 54.43
Vested, end of period, weighted-average grant-date fair value (in USD per share) $ 43.14 $ 39.90 $ 38.77