Income Taxes	6 Months Ended
	Feb. 28, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Our effective tax rate for the three months ended February 28, 2021, was (473.4)%, compared to 1.7% for the three months ended February 29, 2020. Our effective tax rate for the six months ended February 28, 2021, was 19.1%, compared to 2.8% for the six months ended February 29, 2020. Our income tax expense reflects the mix of full-year earnings projected across business units and equity management assumptions, which were partially offset by tax benefits related to an intercompany transfer of assets for tax planning. Income taxes and effective tax rate vary each year based on profitability and nonpatronage business activity during each of the comparable years.    Our uncertain tax positions are affected by the tax years that are under audit or remain subject to examination by the relevant taxing authorities. Reserves are recorded against unrecognized tax benefits when we believe certain fully supportable tax return positions are likely to be challenged and we may not prevail. If we were to prevail on all positions taken in relation to uncertain tax positions, $129.8 million and $111.3 million of the unrecognized tax benefits would ultimately benefit our effective tax rate as of February 28, 2021, and August 31, 2020, respectively. It is reasonably possible that the total amount of unrecognized tax benefits could significantly change in the next 12 months.