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Goodwill And Other Intangible Assets (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Aug. 31, 2011
Aug. 31, 2010
Aug. 31, 2009
Non-cash goodwill impairment charge  $ 1,022,821
Weighted average amortization period for aggregate net intangible assets, years7.6  
Amortization of intangibles$ 22,051$ 25,934$ 31,039
Contractual Agreements And Customer Relationships [Member]
   
Maximum life of intangible assets, years10  
Weighted average amortization period for aggregate net intangible assets, years9.5  
Intellectual Property [Member]
   
Maximum life of intangible assets, years5  
Weighted average amortization period for aggregate net intangible assets, years5.0