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 9 Months Ended
May 31, 2014
May 31, 2013
May 31, 2014
May 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense of intangible assets $ 6,272,000 $ 5,539,000 $ 18,713,000 $ 17,542,000
Future amortization expense, remainder of 2014 6,500,000   6,500,000  
Future amortization expense, 2015 25,800,000   25,800,000  
Future amortization expense, 2016 25,800,000   25,800,000  
Future amortization expense, 2017 25,100,000   25,100,000  
Future amortization expense, 2018 24,300,000   24,300,000  
Future amortization expense, 2019 24,100,000   24,100,000  
Future amortization expense, thereafter $ 117,300,000   $ 117,300,000