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Fair Value Of Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	May 31, 2012	Aug. 31, 2011
Fair Value Of Financial Instruments [Abstract]
Senior secured fixed rate notes, fair value	$ 510.0	$ 497.0
Senior secured fixed rate notes, carrying value	$ 485.7	$ 497.0

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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