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Share-Based Compensation (Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) - $ / shares
3 Months Ended
May 08, 2017
Jun. 30, 2017
Jun. 30, 2016
Shares      
Outstanding, beginning of period (in shares)   350,100 467,800
Granted (in shares) 54,773 90,400 49,400
Vested and issued (in shares)   (50,800) (75,600)
Forfeited (in shares)   (2,300) (76,200)
Outstanding, end of period (in shares)   387,400 365,400
Vested, end of period (in shares)   63,700 70,200
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)   56.11 57.16
Vested and issued, weighted-average grant-date fair value (in USD per share)   34.28 31.36
Forfeited, weighted-average grant-date fair value (in USD per share)   50.06 39.93
Outstanding, end of period, weighted-average grant-date fair value (in USD per share)   43.81 38.00
Vested, end of period, weighted-average grant-date fair value (in USD per share)   $ 20.31 $ 14.89