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, 2013
May 31, 2012
May 31, 2013
May 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense of intangible assets $ 5,539,000 $ 5,563,000 $ 17,542,000 $ 16,237,000
Future amortization expense, 2013 5,100,000   5,100,000  
Future amortization expense, 2014 22,000,000   22,000,000  
Future amortization expense, 2015 21,900,000   21,900,000  
Future amortization expense, 2016 21,800,000   21,800,000  
Future amortization expense, 2017 20,800,000   20,800,000  
Future amortization expense, 2018 20,400,000   20,400,000  
Future amortization expense, thereafter $ 105,500,000   $ 105,500,000