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Income Taxes (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
May 26, 2013
May 27, 2012
Income Tax Disclosure [Line Items]    
Prepaid income taxes $ 6.4 $ 12.2
Gross unrecognized tax benefits 29.9 15.7
Unrecognized tax benefits, accrued interest 1.2  
Tax position, change is reasonably possible in the next twelve month 18.6  
State
   
Income Tax Disclosure [Line Items]    
Prepaid income taxes 6.4  
Federal
   
Income Tax Disclosure [Line Items]    
Prepaid income taxes $ 16.5