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Share-Based Compensation (Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) - $ / shares
6 Months Ended
Jul. 30, 2019
May 13, 2019
May 06, 2019
Sep. 30, 2019
Sep. 30, 2018
Shares          
Outstanding, beginning of period (in shares)       413,000.0 393,500
Granted (in shares) 4,183 7,287 89,286 220,300 226,400
Vested and issued (in shares)       (66,800) (175,800)
Forfeited (in shares)       (27,800) (31,100)
Outstanding, end of period (in shares)       538,700 413,000.0
Vested, end of period (in shares)       138,300 113,200
Weighted Average Grant-Date Fair Value          
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share)       $ 36.58 $ 44.13
Granted, weighted-average grant-date fair value (in USD per share)       31.02 30.09
Vested and issued, weighted-average grant-date fair value (in USD per share)       47.99 43.05
Forfeited, weighted-average grant-date fair value (in USD per share)       36.71 48.32
Outstanding, end of period, weighted-average grant-date fair value (in USD per share)       32.88 36.58
Vested, end of period, weighted-average grant-date fair value (in USD per share)       $ 31.71 $ 31.05
Employee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period       3 years  
Director          
Weighted Average Grant-Date Fair Value          
Period following director's term in which RSUs may be settled       6 months  
Maximum | Employee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period       3 years