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Share-Based Compensation (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Shares      
Outstanding, beginning of period (in shares) 871,200 994,900 1,386,400
Granted (in shares) 208,200 317,900 227,700
Exercised (in shares) (348,000) (386,300) (605,000)
Forfeited or expired (in shares) (3,700) (55,300) (14,200)
Outstanding, end of period (in shares) 727,700 871,200 994,900
Exercisable, end of period (in shares) 308,400    
Weighted-Average Exercise Price      
Outstanding, beginning of period, weighted-average exercise price (in USD per share) $ 23.40 $ 15.24 $ 10.43
Options, grant date fair value (in USD per share) 42.13 33.54 29.94
Exercised, weighted-average exercise price (in USD per share) 19.22 10.24 9.76
Forfeited or expired, weighted-average exercise price (in USD per share) 35.72 26.77 14.56
Outstanding, end of period, weighted-average exercise price (in USD per share) 30.70 $ 23.40 $ 15.24
Exercisable, end of period, weighted-average exercise price (in USD per share) $ 21.75    
Options      
Outstanding, end of period, weighted-average remaining contractual term 7 years 7 months 6 days    
Exercisable, end of period, weighted-average remaining contractual term 6 years 6 months    
Outstanding, end of period, aggregate intrinsic value $ 16,512    
Exercisable, end of period, aggregate intrinsic value $ 9,756