Income Taxes - Reconciliation of the Statutory Tax Rates to the Effective Tax Rates (Details)	12 Months Ended
Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory federal income tax rate	21.00%	25.70%	35.00%
State and local income taxes, net of federal income tax benefit	(0.70%)	0.70%	12.10%
Patronage earnings	(14.30%)	(13.60%)	91.70%
Domestic production activities deduction	(9.90%)	(8.40%)	30.50%
Export activities at rates other than the U.S. statutory rate	0.20%	6.10%	51.60%
U.S. tax reform	0.00%	(23.20%)	0.00%
Intercompany transfer of business assets	0.00%	(6.10%)	0.00%
Increase in unrecognized tax benefits	0.20%	6.80%	0.00%
Valuation allowance	0.30%	(3.40%)	(77.10%)
Tax credits	(0.40%)	(0.70%)	(22.80%)
Crack spread contingency	0.00%	0.00%	4.80%
Other	1.30%	(0.80%)	(7.00%)
Effective tax rate	(1.50%)	(15.50%)	164.40%

Effective Income Tax Rate, Rate Reconciliation, Patronage Earnings

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Effective Income Tax Rate Reconciliation, Change In Unrecognized Tax Benefits

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Effective Income Tax Rate Reconciliation, Change in Crack Spread Contingency, Percent

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Effective Income Tax Rate Reconciliation, Intercompany Transfer Of Assets

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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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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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