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Share-Based Compensation (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Shares      
Outstanding, beginning of period (in shares) 728,000.0 1,081,000 1,100,900
Granted (in shares) 109,700 131,100 197,600
Exercised (in shares) (303,400) (440,300) (205,200)
Forfeited (in shares) (15,600) (41,000.0) (10,300)
Expired (in shares)   (2,800) (2,000.0)
Outstanding, end of period (in shares) 518,700 728,000.0 1,081,000
Exercisable, end of period (in shares) 290,300    
Weighted Average Exercise Price      
Outstanding, beginning of period, weighted-average exercise price (in USD per share) $ 48.30 $ 43.96 $ 40.62
Options, grant date fair value (in USD per share) 69.94 61.81 54.48
Exercised, weighted-average exercise price (in USD per share) 48.77 41.08 35.93
Forfeited weighted average exercise price (in USD per share) 60.87 54.15 49.53
Expired weighted average exercise price (in USD per share)   54.47 42.63
Outstanding, end of period, weighted-average exercise price (in USD per share) 52.22 $ 48.30 $ 43.96
Exercisable, end of period, weighted-average exercise price (in USD per share) $ 42.92    
Options      
Outstanding, end of period, weighted-average remaining contractual term 6 years 8 months 12 days    
Exercisable, end of period, weighted-average remaining contractual term 5 years 4 months 24 days    
Outstanding, end of period, aggregate intrinsic value $ 17,507    
Exercisable, end of period, aggregate intrinsic value $ 12,499