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, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense of intangible assets $ 6,226,000 $ 5,968,000 $ 12,441,000 $ 12,002,000
Future amortization expense, remainder of 2014 12,400,000   12,400,000  
Future amortization expense, 2015 24,800,000   24,800,000  
Future amortization expense, 2016 24,700,000   24,700,000  
Future amortization expense, 2017 24,100,000   24,100,000  
Future amortization expense, 2018 23,300,000   23,300,000  
Future amortization expense, 2019 23,100,000   23,100,000  
Future amortization expense, thereafter $ 112,500,000   $ 112,500,000