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Share-Based Compensation (Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) - $ / shares
6 Months Ended
May 07, 2018
Sep. 30, 2018
Sep. 30, 2017
Shares      
Outstanding, beginning of period (in shares)   393,500 350,100
Granted (in shares) 100,399 226,400 105,800
Vested and issued (in shares)   (175,800) (53,300)
Forfeited (in shares)   (31,100) (6,700)
Outstanding, end of period (in shares)   413,000 395,900
Vested, end of period (in shares)   113,200 90,500
Weighted- Average Grant-Date Fair Value      
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share)   $ 44.13 $ 39.29
Granted, weighted-average grant-date fair value (in USD per share)   30.09 55.61
Vested and issued, weighted-average grant-date fair value (in USD per share)   43.05 34.30
Forfeited, weighted-average grant-date fair value (in USD per share)   48.32 49.30
Outstanding, end of period, weighted-average grant-date fair value (in USD per share)   36.58 44.15
Vested, end of period, weighted-average grant-date fair value (in USD per share)   $ 31.05 $ 29.88