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Share-Based Compensation (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Shares    
Outstanding, beginning of period (in shares) 727,700 871,200
Granted (in shares) 264,300 208,200
Exercised (in shares) (107,900) (336,900)
Forfeited or expired (in shares) (92,200) (2,100)
Outstanding, end of period (in shares) 791,900 740,400
Exercisable, end of period (in shares) 387,000 313,500
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) 55.86 42.13
Exercised, weighted-average exercise price (in USD per share) 31.91 18.99
Forfeited or expired, weighted-average exercise price (in USD per share) 42.62 38.21
Outstanding, end of period, weighted-average exercise price (in USD per share) 37.54 30.63
Exercisable, end of period, weighted-average exercise price (in USD per share) $ 25.70 $ 21.68
Options, Additional Disclosures:    
Outstanding, end of period, weighted-average remaining contractual term 7 years 4 months 24 days 7 years 10 months 24 days
Exercisable, end of period, weighted-average remaining contractual term 6 years 3 months 18 days 6 years 8 months 12 days
Outstanding, end of period, aggregate intrinsic value $ 12,543 $ 15,325
Exercisable, end of period, aggregate intrinsic value $ 10,217 $ 9,341