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Debt (Details) (USD $)
In Millions, unless otherwise specified
Aug. 31, 2013
Jun. 01, 2013
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Outstanding $ 7.3  
Line Of Credit Facility, Increase in Borrowing Capacity 75  
Letters of Credit Outstanding, Amount 7.3 7.7
Revolving Line of Credit, Domestic [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 150  
Subsequent Event [Member] | Revolving Line of Credit, Foreign [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Current Borrowing Capacity $ 5.0