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Executive Stock Plans And Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense related to stock-based awards $ 3.7    
unrecognized compensation expense related to stock-based awards, weighted-average period expected to recognized 1.1    
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    
Closing market price $ 46.60 $ 43.54 $ 52.69
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    
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period following grant date, in years 10    
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    
2002 Executive Stock Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of common stock expected to issue under the Plans 500,000    
2002 Executive Stock Plan [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of common stock expected to issue under the Plans 2,000,000    
2007 Stock Incentive Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of common stock expected to issue under the Plans 750,000