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Goodwill And Other Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Amortization expense for intangible assets	$ 5.9	$ 9.9	$ 11.2
Favorable land leases [Member]
Weighted average remaining useful lives	77 years
Intangible assets excluding favorable land leases [Member]
Weighted average remaining useful lives	5 years

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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