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Share-Based Compensation Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Shares    
Outstanding, beginning of period (in shares) 1,114,900 1,020,200
Granted (in shares) 234,200 249,900
Exercised (in shares) (87,600) (62,800)
Forfeited (in shares) (13,700) 0
Expired (in shares) (8,500) 0
Outstanding, end of period (in shares) 1,239,300 1,207,300
Exercisable, end of period (in shares) 759,700 699,100
Weighted Average Exercise Price    
Outstanding, beginning of period, weighted-average exercise price (in USD per share) $ 37.92 $ 35.90
Granted, weighted-average exercise price (in USD per share) 44.74 39.98
Exercised, weighted-average exercise price (in USD per share) 30.91 20.46
Forfeited, weighted-average exercise price (in USD per share) 37.83 0
Expired, weighted-average exercise price (in USD per share) 56.63 0
Outstanding, end of period, weighted-average exercise price (in USD per share) 39.58 37.55
Exercisable, end of period, weighted-average exercise price (in USD per share) $ 39.06 $ 39.39
Options, Additional Disclosures:    
Outstanding, end of period, weighted-average remaining contractual term 6 years 8 months 12 days 7 years
Exercisable, end of period, weighted-average remaining contractual term 5 years 3 months 18 days 5 years 7 months 6 days
Outstanding, end of period, aggregate intrinsic value $ 20,593 $ 5,032
Exercisable, end of period, aggregate intrinsic value $ 13,060 $ 3,430