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Derivative Financial Instruments and Hedging Activities Gains (Losses) Included in Other Comprehensive Income on Derivatives Accounted for as Hedging Instruments, Net of Tax (Details) (USD $)	May 31, 2014	Aug. 31, 2013	May 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, tax effect of unrealized gain or loss deferred into accumulated other comprehensive income	$ 0	$ 9,200,000	$ 3,500,000
Interest Rate Swap [Member] \| Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	$ 0	$ 14,930,000	$ 5,666,000

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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