Annual report pursuant to Section 13 and 15(d)

Earnings before Income Taxes, Including both Continuing and Discontinued Operations (Detail)

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Earnings before Income Taxes, Including both Continuing and Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Income Tax Examination [Line Items]      
Earnings before income taxes, including both continuing and discontinued operations $ 120,314 $ 142,221 $ 48,011
Domestic Tax Authority
      
Income Tax Examination [Line Items]      
Earnings before income taxes, including both continuing and discontinued operations 79,467 40,096 14,967
Foreign Tax Authority
      
Income Tax Examination [Line Items]      
Earnings before income taxes, including both continuing and discontinued operations $ 40,847 $ 102,125 $ 33,044