Equity (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Patronage [Line Items]
Total Patronage refunds, estimated	$ 280,300
Estimated Patronage distributed in cash	50,000
Patronage distributed in cash	30,000	$ 90,100	$ 75,800
nonqualified patronage, estimated	230,300
nonqualified patronage	214,800	474,400	353,000
Total patronage	$ 244,800	$ 564,500	$ 428,800