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Share-Based Awards and Options - Restricted Stock and Performance Units Narrative (Details)
12 Months Ended
May. 31, 2015
type
shares
May. 31, 2014
shares
May. 31, 2013
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 306,366 0 0
Restricted Stock and Restricted Stock Units | One Year Increment [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 3 years    
Performance Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of types of performance units offered | type 3    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period   1 year  
Performance Restricted Stock Units | One Year Increment [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage   25.00%  
Performance Restricted Stock Units | Three Year Equal Vesting      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage   75.00%  
Performance Restricted Stock Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target shares of company stock 200.00%    
Leveraged Performance Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award performance period 3 years    
Leveraged Performance Units | Share-based Compensation Award, Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage 50.00%    
Leveraged Performance Units | Share-based Compensation Award, Tranche Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage 50.00%    
Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Conversion of Stock, Shares Converted 0.33    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Conversion of Stock, Shares Converted 0.66    
Granted Before Fiscal 2015 [Member] | Restricted Stock and Restricted Stock Units | Share-based Compensation Award, Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage 25.00%    
Granted Before Fiscal 2015 [Member] | Restricted Stock and Restricted Stock Units | Share-based Compensation Award, Tranche Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage 25.00%    
Granted Before Fiscal 2015 [Member] | Restricted Stock and Restricted Stock Units | Share-based Compensation Award, Tranche Three      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage 25.00%    
Granted Before Fiscal 2015 [Member] | Restricted Stock and Restricted Stock Units | Share-based Compensation Award, Tranche Four      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage 25.00%    
Granted Fiscal 2015 [Member] | Restricted Stock and Restricted Stock Units | Share-based Compensation Award, Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage 33.00%    
Granted Fiscal 2015 [Member] | Restricted Stock and Restricted Stock Units | Share-based Compensation Award, Tranche Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage 33.00%    
Granted Fiscal 2015 [Member] | Restricted Stock and Restricted Stock Units | Share-based Compensation Award, Tranche Three      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage 33.00%