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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Aug. 31, 2013
Sep. 01, 2012
Income Tax Disclosure [Abstract]    
Effective Income Tax Rate, Continuing Operations 34.70% 33.50%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 35.00%  
Liability for Uncertain Tax Positions, Current $ 1.3 $ 1.3
Income Tax Examination, Penalties and Interest Accrued $ 0.5 $ 0.5