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Commitments and Contingencies Contingencies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Aug. 31, 2013
Nov. 30, 2013
Loss Contingencies [Line Items]    
Loss Contingency, Range of Possible Loss, Minimum   $ 14.4
Loss Contingency, Range of Possible Loss, Maximum   39.7
Loss Contingency, Loss in Period $ 25.0