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Share-Based Compensation (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Shares    
Outstanding, beginning of period (in shares) 727,700 871,200
Granted (in shares) 250,600 200,100
Exercised (in shares) (107,100) (336,900)
Forfeited or expired (in shares) (90,700) (2,100)
Outstanding, end of period (in shares) 780,500 732,300
Exercisable, end of period (in shares) 383,700 319,500
Weighted- Average Exercise Price    
Outstanding, beginning of period, weighted-average exercise price (in USD per share) $ 30.70 $ 23.40
Granted, weighted-average exercise price (in USD per share) 56.17 41.80
Exercised, weighted-average exercise price (in USD per share) 31.97 18.99
Forfeited or expired, weighted-average exercise price (in USD per share) 42.56 38.16
Outstanding, end of period, weighted-average exercise price (in USD per share) 37.33 30.42
Exercisable, end of period, weighted-average exercise price (in USD per share) $ 25.61 $ 21.91
Options, Additional Disclosures:    
Outstanding, end of period, weighted-average remaining contractual term 7 years 6 months 8 years 1 month 1 day
Exercisable, end of period, weighted-average remaining contractual term 6 years 6 months 7 years
Outstanding, end of period, aggregate intrinsic value $ 10,326 $ 10,816
Exercisable, end of period, aggregate intrinsic value $ 8,693 $ 7,430