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Share-Based Compensation (Restricted Shares Activity) (Details) - Restricted Stock Units (RSUs) - $ / shares
12 Months Ended
May 04, 2020
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Shares        
Outstanding, beginning of period (in shares)   512,100 413,000.0 393,500
Granted (in shares) 907 179,700 220,300 226,400
Vested and issued (in shares)   (74,000.0) (87,000.0) (175,800)
Forfeited (in shares)   (10,400) (34,200) (31,100)
Outstanding, end of period (in shares)   607,400 512,100 413,000.0
Vested, end of period (in shares)   150,400 124,200 113,200
Weighted-Average Grant-Date Fair Value        
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share)   $ 32.49 $ 36.58 $ 44.13
Granted, weighted-average grant-date fair value (in USD per share)   39.82 31.02 30.09
Vested and issued, weighted-average grant-date fair value (in USD per share)   44.38 46.78 43.05
Forfeited, weighted-average grant-date fair value (in USD per share)   43.37 35.97 48.32
Outstanding, end of period, weighted-average grant-date fair value (in USD per share)   33.02 32.49 36.58
Vested, end of period, weighted-average grant-date fair value (in USD per share)   $ 31.98 $ 30.54 $ 31.05