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Goodwill and Other Intangible Assets - Schedule of Future Estimated Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2013
Aug. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Net carrying amount $ 26,628 $ 27,685
Trade Names [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Remainder of fiscal year 2013 926  
Fiscal year 2014 1,853  
Fiscal year 2015 1,853  
Fiscal year 2016 1,853  
Fiscal year 2017 1,853  
Thereafter 18,290  
Net carrying amount $ 26,628