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Share-Based Compensation Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Shares    
Outstanding, beginning of period (in shares) 1,100,900 1,114,900
Granted (in shares) 197,600 222,700
Exercised (in shares) (39,100) (67,900)
Forfeited (in shares)   (9,200)
Expired (in shares)   (8,400)
Outstanding, end of period (in shares) 1,259,400 1,252,100
Exercisable, end of period (in shares) 827,000.0 779,500
Weighted Average Exercise Price    
Outstanding, beginning of period, weighted-average exercise price (in USD per share) $ 40.62 $ 37.92
Granted, weighted-average exercise price (in USD per share) 54.48 44.33
Exercised, weighted-average exercise price (in USD per share) 38.04 32.49
Forfeited, weighted-average exercise price (in USD per share)   36.45
Expired, weighted-average exercise price (in USD per share)   56.63
Outstanding, end of period, weighted-average exercise price (in USD per share) 42.88 39.24
Exercisable, end of period, weighted-average exercise price (in USD per share) $ 39.98 $ 38.72
Options, Additional Disclosures:    
Outstanding, end of period, weighted-average remaining contractual term 6 years 10 months 24 days 6 years 10 months 24 days
Exercisable, end of period, weighted-average remaining contractual term 5 years 8 months 12 days 5 years 7 months 6 days
Outstanding, end of period, aggregate intrinsic value $ 20,052 $ 17,068
Exercisable, end of period, aggregate intrinsic value $ 15,567 $ 11,399