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Share-Based Compensation (Restricted Shares Activity) (Details) - Restricted Stock Units (RSUs) - $ / shares
12 Months Ended
Aug. 02, 2016
May 09, 2016
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Shares          
Outstanding, beginning of period (in shares)     467,800 362,300 437,500
Granted (in shares) 1,896 49,064 68,400 266,100 106,900
Vested and issued (in shares)     (94,700) (155,600) (154,400)
Forfeited (in shares)     (91,400) (5,000) (27,700)
Outstanding, end of period (in shares)     350,100 467,800 362,300
Vested, end of period (in shares)     63,400 69,800 76,600
Weighted-Average Grant-Date Fair Value          
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share)     $ 35.22 $ 22.74 $ 16.76
Granted, weighted-average grant-date fair value (in USD per share)     55.44 42.41 33.33
Vested, weighted-average grant-date fair value (in USD per share)     28.51 18.31 13.37
Forfeited, weighted-average grant-date fair value (in USD per share)     41.71 39.61 21.45
Outstanding, end of period, weighted-average grant-date fair value (in USD per share)     39.29 35.22 22.74
Vested, end of period, weighted-average grant-date fair value (in USD per share)     $ 20.12 $ 14.76 $ 11.62