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Share-Based Compensation (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Shares    
Outstanding, beginning of period (in shares) 1,020,200 944,600
Granted (in shares) 249,900 302,700
Exercised (in shares) (65,800) (36,000.0)
Forfeited or expired (in shares) 0 (155,300)
Outstanding, end of period (in shares) 1,204,300 1,056,000.0
Exercisable, end of period (in shares) 696,200 602,000.0
Weighted Average Exercise Price    
Outstanding, beginning of period, weighted-average exercise price (in USD per share) $ 35.90 $ 38.45
Granted, weighted-average exercise price (in USD per share) 39.98 30.53
Exercised, weighted-average exercise price (in USD per share) 20.14 27.96
Forfeited or expired, weighted-average exercise price (in USD per share) 0 41.18
Outstanding, end of period, weighted-average exercise price (in USD per share) 37.61 36.14
Exercisable, end of period, weighted-average exercise price (in USD per share) $ 39.50 $ 38.90
Options, Additional Disclosures:    
Outstanding, end of period, weighted-average remaining contractual term 6 years 9 months 18 days 6 years 10 months 24 days
Exercisable, end of period, weighted-average remaining contractual term 5 years 4 months 24 days 5 years 4 months 24 days
Outstanding, end of period, aggregate intrinsic value $ 3,987 $ 9,035
Exercisable, end of period, aggregate intrinsic value $ 2,786 $ 4,756