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Income Taxes - Reconciliation of the Statutory Tax Rates to the Effective Tax Rates (Details)
12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Statutory federal income tax rate 35.00% 35.00% 35.00%
State and local income taxes, net of federal income tax benefit 1.60% 0.90% 0.50%
Patronage earnings (20.50%) (22.90%) (24.20%)
Domestic production activities deduction (10.00%) (8.50%) (3.50%)
Export activities at rates other than the U.S. statutory rate 1.20% 0.60% 0.40%
Valuation allowance 1.70% 2.30% 0.60%
Tax credits (3.10%) (0.50%) (1.30%)
Non-controlling interests 0.00% (0.10%) (1.90%)
Other (1.60%) 1.50% 0.10%
Effective tax rate 4.30% 8.30% 5.70%