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Share-Based Compensation (Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) - $ / shares
9 Months Ended
Aug. 02, 2016
May 09, 2016
Dec. 31, 2016
Dec. 31, 2015
Shares        
Outstanding, beginning of period (in shares)     467,800 362,300
Granted (in shares) 1,896 49,064 68,400 266,100
Vested and issued (in shares)     (94,700) (153,600)
Forfeited (in shares)     (91,400) (1,400)
Outstanding, end of period (in shares)     350,100 473,400
Vested, end of period (in shares)     63,400 69,800
Weighted- Average Grant-Date Fair Value        
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share)     $ 35.22 $ 22.74
Granted, weighted-average grant-date fair value (in USD per share)     55.44 42.41
Vested and issued, weighted-average grant-date fair value (in USD per share)     28.51 18.16
Forfeited, weighted-average grant-date fair value (in USD per share)     41.71 33.50
Outstanding, end of period, weighted-average grant-date fair value (in USD per share)     39.29 35.25
Vested, end of period, weighted-average grant-date fair value (in USD per share)     $ 20.12 $ 14.76