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Share-Based Compensation (Restricted Shares Activity) (Details) - Restricted Stock Units (RSUs) - $ / shares
12 Months Ended
May 07, 2018
Aug. 01, 2017
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Shares          
Outstanding, beginning of period (in shares)     393,500 350,100 467,800
Granted (in shares) 100,399 3,779 226,400 105,800 68,400
Vested and issued (in shares)     (175,800) (53,300) (94,700)
Forfeited (in shares)     (31,100) (9,100) (91,400)
Outstanding, end of period (in shares)     413,000 393,500 350,100
Vested, end of period (in shares)     113,200 90,500 63,400
Weighted-Average Grant-Date Fair Value          
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share)     $ 44.13 $ 39.29 $ 35.22
Granted, weighted-average grant-date fair value (in USD per share)     30.09 55.61 55.44
Vested and issued, weighted-average grant-date fair value (in USD per share)     43.05 34.30 28.51
Forfeited, weighted-average grant-date fair value (in USD per share)     48.32 48.76 41.71
Outstanding, end of period, weighted-average grant-date fair value (in USD per share)     36.58 44.13 39.29
Vested, end of period, weighted-average grant-date fair value (in USD per share)     $ 31.05 $ 29.88 $ 20.12