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Summary of Significant Accounting Policies Pretax gains and losses on hedging instruments (Details) (USD $)	3 Months Ended
	Nov. 30, 2013	Nov. 30, 2013 Designated as Hedging Instrument [Member] Interest Rate Swap [Member] Cash Flow Hedging [Member]	Aug. 31, 2013 Designated as Hedging Instrument [Member] Interest Rate Swap [Member] Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 1,200,000
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax		$ 11,663,000	$ 14,930,000

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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