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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 7.1 $ 5.7
Expected stock based compensation for remaining fiscal year $ 1.3  
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 5 years  
Performance Share Awards (PSAs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Minimum [Member] | Performance Share Awards (PSAs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of award grant paid 0.00%  
Maximum [Member] | Performance Share Awards (PSAs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of award grant paid 150.00%  
Outside Directors [Member] | Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years