Equities Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) (Details) (Reclassification out of Accumulated Other Comprehensive Income [Member], Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Feb. 28, 2014	Feb. 28, 2014
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring	$ 13.5	$ 13.5