Annual report pursuant to Section 13 and 15(d)

Reconciliation of Income Taxes at Federal Statutory Rate to Effective Tax Rate (Detail)

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Reconciliation of Income Taxes at Federal Statutory Rate to Effective Tax Rate (Detail)
12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Reconciliation of Effective Income Tax Rate [Line Items]      
Federal statutory rate 35.00% 35.00% 35.00%
State income taxes, net of Federal effect 1.90% 0.50% 0.40%
Net effect of foreign tax rates and credits (22.20%) (13.10%) (23.50%)
Restructuring and valuation allowance 0.70% (2.60%) (1.90%)
Impairment charge 13.70%    
Other items (1.60%) [1] 2.00% [1] 11.10% [1]
Effective income tax rate 27.50% 21.80% 21.10%
[1] Other items for the year ended August 31, 2010 of 11.1% includes provision to return adjustments and additional provisions for unrecognized tax benefits.