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Share-Based Compensation (Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) - $ / shares
6 Months Ended
Aug. 01, 2017
May 08, 2017
Sep. 30, 2017
Sep. 30, 2016
Shares        
Outstanding, beginning of period (in shares)     350,100 467,800
Granted (in shares) 2,564 54,773 105,800 65,800
Vested and issued (in shares)     (53,300) (92,700)
Forfeited (in shares)     (6,700) (91,000)
Outstanding, end of period (in shares)     395,900 349,900
Vested, end of period (in shares)     90,500 63,400
Weighted- Average Grant-Date Fair Value        
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share)     $ 39.29 $ 35.22
Granted, weighted-average grant-date fair value (in USD per share)     55.61 55.65
Vested and issued, weighted-average grant-date fair value (in USD per share)     34.30 28.47
Forfeited, weighted-average grant-date fair value (in USD per share)     49.30 41.69
Outstanding, end of period, weighted-average grant-date fair value (in USD per share)     44.15 39.16
Vested, end of period, weighted-average grant-date fair value (in USD per share)     $ 29.88 $ 20.12