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Commitments and Contingencies - Contingencies (Details) (Necessary Maintenance And Repairs [Member], USD $)
In Millions, unless otherwise specified
Aug. 31, 2013
Jun. 01, 2013
Loss Contingencies [Line Items]    
Loss Contingency, Range of Possible Loss, Minimum $ 0  
Loss Contingency, Range of Possible Loss, Maximum 3.0  
Other Accrued Liabilities [Member]
   
Loss Contingencies [Line Items]    
Loss Contingency Accrual, at Carrying Value $ 1.3 $ 1.3