Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Additional Information (Detail)

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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
 3 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization expense of intangible assets $ 6,215,000 $ 6,034,000
Future amortization expense, remainder of 2014 18,800,000  
Future amortization expense, 2015 24,800,000  
Future amortization expense, 2016 24,700,000  
Future amortization expense, 2017 23,700,000  
Future amortization expense, 2018 23,300,000  
Future amortization expense, 2019 23,100,000  
Future amortization expense, thereafter $ 110,600,000