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Intangible Assets And Goodwill (Range Of Remaining Estimated Useful Lives And Weighted-Average Amortization) (Details)
12 Months Ended
Aug. 31, 2012
License Rights [Member]
 
Intangible Assets And Goodwill [Line Items]  
Remaining useful life 14 years
Weighted average amortization period 30 years
Curriculum [Member]
 
Intangible Assets And Goodwill [Line Items]  
Weighted average amortization period 26 years
Customer Lists [Member]
 
Intangible Assets And Goodwill [Line Items]  
Weighted average amortization period 14 years
Minimum [Member] | Curriculum [Member]
 
Intangible Assets And Goodwill [Line Items]  
Remaining useful life 2 years
Maximum [Member] | Curriculum [Member]
 
Intangible Assets And Goodwill [Line Items]  
Weighted average amortization period 14 years
Maximum [Member] | Customer Lists [Member]
 
Intangible Assets And Goodwill [Line Items]  
Remaining useful life 1 year