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Share-Based Compensation (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Shares    
Outstanding, beginning of period (in shares) 772,300 727,700
Granted (in shares) 182,800 264,300
Exercised (in shares) (51,000) (107,900)
Forfeited or expired (in shares) (22,100) (92,200)
Outstanding, end of period (in shares) 882,000 791,900
Exercisable, end of period (in shares) 502,900 387,000
Weighted- Average Exercise Price    
Outstanding, beginning of period, weighted-average exercise price (in USD per share) $ 37.70 $ 30.70
Granted, weighted-average exercise price (in USD per share) 56.11 55.86
Exercised, weighted-average exercise price (in USD per share) 28.76 31.91
Forfeited or expired, weighted-average exercise price (in USD per share) 48.15 42.62
Outstanding, end of period, weighted-average exercise price (in USD per share) 41.77 37.54
Exercisable, end of period, weighted-average exercise price (in USD per share) $ 32.50 $ 25.70
Options, Additional Disclosures:    
Outstanding, end of period, weighted-average remaining contractual term 7 years 2 months 12 days 7 years 4 months 24 days
Exercisable, end of period, weighted-average remaining contractual term 6 years 1 month 6 days 6 years 3 months 18 days
Outstanding, end of period, aggregate intrinsic value $ 7,019 $ 12,543
Exercisable, end of period, aggregate intrinsic value $ 6,884 $ 10,217