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Share-Based Compensation (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Shares    
Outstanding, beginning of period (in shares) 772,300 727,700
Granted (in shares) 182,800 250,600
Exercised (in shares) (51,000) (107,100)
Forfeited or expired (in shares) (19,000) (90,700)
Outstanding, end of period (in shares) 885,100 780,500
Exercisable, end of period (in shares) 498,400 383,700
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 56.17
Exercised, weighted-average exercise price (in USD per share) 28.76 31.97
Forfeited or expired, weighted-average exercise price (in USD per share) 47.57 42.56
Outstanding, end of period, weighted-average exercise price (in USD per share) 41.80 37.33
Exercisable, end of period, weighted-average exercise price (in USD per share) $ 32.34 $ 25.61
Options, Additional Disclosures:    
Outstanding, end of period, weighted-average remaining contractual term 7 years 5 months 30 days 7 years 6 months
Exercisable, end of period, weighted-average remaining contractual term 6 years 3 months 18 days 6 years 6 months
Outstanding, end of period, aggregate intrinsic value $ 9,768 $ 10,326
Exercisable, end of period, aggregate intrinsic value $ 9,305 $ 8,693