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, 2012
May 31, 2011
May 31, 2012
May 31, 2011
Schedule of Actual and Estimated Amortization Expense [Line Items]        
Amortization expense of intangible assets $ 7,393,000 $ 6,871,000 $ 21,684,000 $ 19,846,000
Future amortization expense, remainder of fiscal year 2012 7,400,000   7,400,000  
Future amortization expense, 2013 27,800,000   27,800,000  
Future amortization expense, 2014 26,200,000   26,200,000  
Future amortization expense, 2015 26,100,000   26,100,000  
Future amortization expense, 2016 25,900,000   25,900,000  
Future amortization expense, thereafter $ 178,600,000   $ 178,600,000