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Stock-Based Compensation (Recognized Stock-Based Compensation Expense) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Aug. 26, 2012
Aug. 28, 2011
Stock-based compensation expense $ 14.4 $ 11.5
Stock Options
   
Stock-based compensation expense 4.8 5.0
Restricted Stock/Restricted Stock Units
   
Stock-based compensation expense 0.6 1.3
Darden Stock Units
   
Stock-based compensation expense 4.8 2.1
Performance Stock Units
   
Stock-based compensation expense 3.7 2.6
Employee Stock Purchase Plan
   
Stock-based compensation expense 0.4 0.4
Director Compensation Program/Other
   
Stock-based compensation expense $ 0.1 $ 0.1