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Income Taxes - Reconciliation of the Statutory Tax Rates to the Effective Tax Rates (Details)	12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013
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	(0.50%)	1.60%	0.90%
Patronage earnings	(29.00%)	(20.50%)	(22.90%)
Domestic production activities deduction	(5.60%)	(10.00%)	(8.50%)
Export activities at rates other than the U.S. statutory rate	(0.20%)	1.20%	0.60%
Valuation allowance	(0.10%)	1.70%	2.30%
Tax credits	(0.80%)	(3.10%)	(0.50%)
Non-controlling interests	0.00%	0.00%	(0.10%)
Other	(0.40%)	(1.60%)	1.50%
Effective tax rate	(1.60%)	4.30%	8.30%

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Effective Income Tax Rate, Rate Reconciliation, Patronage Earnings

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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