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Stock-Based Compensation (Recognized Stock-Based Compensation Expense) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Aug. 24, 2014
Aug. 25, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense $ 6.2 $ 8.7
Stock Options
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense 3.2 4.2
Restricted Stock/ Restricted Stock Units
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense 0.4 0.4
Darden Stock Units
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense 1.3 1.8
Performance stock units
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense 0.9 1.8
Employee stock purchase plan
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense $ 0.4 $ 0.5