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Share-Based Compensation Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) - $ / shares
6 Months Ended
May 03, 2021
Sep. 30, 2021
Sep. 30, 2020
Shares      
Outstanding, beginning of period (in shares)   457,000.0 387,900
Granted (in shares) 1,636 170,800 179,700
Vested (in shares)   (162,300) (100,200)
Forfeited (in shares)   (24,600) (4,700)
Outstanding, end of period (in shares)   440,900 462,700
Vested, end of period (in shares)   152,300 150,400
Weighted Average Grant-Date Fair Value      
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share)   $ 33.52 $ 33.11
Granted, weighted-average grant-date fair value (in USD per share)   45.32 40.22
Vested, weighted-average grant-date fair value (in USD per share)   32.99 42.94
Forfeited, weighted-average grant-date fair value (in USD per share)   30.54 56.11
Outstanding, end of period, weighted-average grant-date fair value (in USD per share)   38.45 33.51
Vested, end of period, weighted-average grant-date fair value (in USD per share)   $ 33.92 $ 31.98