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Income Taxes - Reconciliation of the Statutory Tax Rates to the Effective Tax Rates (Details) | 12 Months Ended
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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%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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