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Goodwill and Other Intangible Assets - Schedule of Future Estimated Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2012
Aug. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Net carrying amount $ 27,257 $ 27,685
Trade Names [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Remainder of fiscal year 2013 1,396  
Fiscal year 2014 1,862  
Fiscal year 2015 1,862  
Fiscal year 2016 1,862  
Fiscal year 2017 1,862  
Thereafter 18,413  
Net carrying amount $ 27,257