Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Aug. 31, 2012
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Income Taxes [Line Items]        
Foreign loss carryforwards expiring at various dates between 2013 and 2021 $ 5,800,000 $ 5,800,000    
Recognized interest and penalties related to unrecognized tax benefits   4,500,000 5,100,000 4,200,000
Undistributed earnings 412,800,000 412,800,000    
Additional provision for undistributed earnings 86,200,000 86,200,000    
Impairment charge 62,464,000 62,464,000    
Debt refinancing charges   16,830,000    
Income taxes, net of refunds   56,500,000 23,100,000 6,500,000
Minimum
       
Income Taxes [Line Items]        
Estimated unrecognized tax benefit increase (decrease) within the next twelve 6,500,000 6,500,000    
Maximum
       
Income Taxes [Line Items]        
Estimated unrecognized tax benefit increase (decrease) within the next twelve $ 8,000,000 $ 8,000,000