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Share-Based Compensation - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Shares    
Outstanding, beginning of period (in shares) | shares 1,100,900 1,114,900
Granted (in shares) | shares 197,600 234,200
Exercised (in shares) | shares (39,100) (87,600)
Forfeited (in shares) | shares   (13,700)
Expired (in shares) | shares   (8,500)
Outstanding, end of period (in shares) | shares 1,259,400 1,239,300
Exercisable, end of period (in shares) | shares 830,800 759,700
Weighted Average Exercise Price    
Outstanding, beginning of period, weighted-average exercise price (in USD per share) | $ / shares $ 40.62 $ 37.92
Granted, weighted-average exercise price (in USD per share) | $ / shares 54.48 44.74
Exercised, weighted-average exercise price (in USD per share) | $ / shares 38.04 30.91
Forfeited, weighted-average exercise price (in USD per share) | $ / shares   37.83
Expired, weighted-average exercise price (in USD per share) | $ / shares   56.63
Outstanding, end of period, weighted-average exercise price (in USD per share) | $ / shares 42.88 39.58
Exercisable, end of period, weighted-average exercise price (in USD per share) | $ / shares $ 40.04 $ 39.06
Options, Additional Disclosures:    
Outstanding, end of period, weighted-average remaining contractual term 6 years 7 months 6 days 6 years 8 months 12 days
Exercisable, end of period, weighted-average remaining contractual term 5 years 4 months 24 days 5 years 3 months 18 days
Outstanding, end of period, aggregate intrinsic value | $ $ 10,963 $ 20,593
Exercisable, end of period, aggregate intrinsic value | $ $ 9,403 $ 13,060