Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets Narrative (Detail)

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Goodwill and Other Intangible Assets Narrative (Detail) (USD $)
 12 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]      
Cumulative goodwill impairment charges $ 22,200,000 $ 22,200,000  
Amortization expense of intangible assets 22,939,000 22,026,000 21,523,000
Future amortization expense, 2014 24,600,000    
Future amortization expense, 2015 24,600,000    
Future amortization expense, 2016 24,500,000    
Future amortization expense, 2017 23,400,000    
Future amortization expense, 2018 23,000,000    
Future amortization expense, thereafter $ 132,000,000