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Share-Based Compensation (Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) - $ / shares
3 Months Ended
May 13, 2019
May 06, 2019
Jun. 30, 2019
Jun. 30, 2018
Shares        
Outstanding, beginning of period (in shares)     413,000.0 393,500
Granted (in shares) 7,287 89,286 195,200 203,800
Vested and issued (in shares)     (61,800) (173,400)
Forfeited (in shares)     (25,200) (31,100)
Outstanding, end of period (in shares)     521,200 392,800
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)     $ 36.58 $ 44.13
Granted, weighted-average grant-date fair value (in USD per share)     30.55 29.46
Vested and issued, weighted-average grant-date fair value (in USD per share)     48.04 43.00
Forfeited, weighted-average grant-date fair value (in USD per share)     36.85 48.32
Outstanding, end of period, weighted-average grant-date fair value (in USD per share)     32.94 36.68
Vested, end of period, weighted-average grant-date fair value (in USD per share)     $ 31.05 $ 29.88
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