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Summary of Significant Accounting Policies - Derivative Instruments Designated as Hedging Instruments (Details) (Designated as Hedging Instrument [Member], Cash Flow Hedging [Member], Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	May 31, 2013	Aug. 31, 2012	May 31, 2012
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Assets	$ 9,160

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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