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 6 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense of intangible assets $ 7,638,000 $ 7,073,000 $ 15,492,000 $ 14,291,000
Future amortization expense, 2013 14,300,000   14,300,000  
Future amortization expense, 2014 28,100,000   28,100,000  
Future amortization expense, 2015 28,000,000   28,000,000  
Future amortization expense, 2016 27,800,000   27,800,000  
Future amortization expense, 2017 26,600,000   26,600,000  
Future amortization expense, 2018 26,200,000   26,200,000  
Future amortization expense, thereafter $ 142,900,000   $ 142,900,000