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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Aug. 31, 2013
Sep. 01, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense $ 2.8 $ 1.8
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 1.0 $ 0.7
Stock Purchase Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 4,000,000  
Percent of Market Price 85.00%