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Income Taxes - Reconciliation of the Statutory Tax Rates to the Effective Tax Rates (Details)
12 Months Ended
Aug. 31, 2022
Aug. 31, 2021
Aug. 31, 2020
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Statutory federal income tax rate 21.00% 21.00% 21.00%
State and local income taxes, net of federal income tax benefit 1.10% (2.60%) (1.80%)
Patronage earnings (13.60%) (11.40%) (13.10%)
Effective Income Tax Rate Reconciliation, Deduction, Percent 3.20% 8.20% 19.00%
Export activities at rates other than the U.S. statutory rate 0.40% 0.50% 1.80%
Intercompany transfer of business assets (0.10%) (4.70%) (1.60%)
Increase in unrecognized tax benefits 0.00% 0.80% 4.20%
Valuation allowance 0.20% (0.20%) (1.00%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent 0.00% 0.00% 0.20%
Other 1.50% (2.60%) (0.20%)
Effective tax rate 7.30% (7.40%) (9.50%)