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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 3.4 $ 3.4
Expected Stock Based Compensation For Remaining Current Period $ 2.0  
Stock Option [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period following grant date, in years 10  
Stock Appreciation Rights (SARs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Description of award vesting rights for SARs vest in equal one-third tranches one, two, and three years after the grant date  
Expiration period following grant date, in years 10  
Restricted Stock Units (RSUs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period, in years 5  
Performance Share Awards (PSAs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period, in years 3  
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, in years 3  
Plans After Fiscal 2007 [Member] | Stock Appreciation Rights (SARs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period following grant date, in years 10  
Expiration period following grantee retirement, in years 3