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Equities - Narrative (Details)
$ in Thousands
 12 Months Ended
Aug. 31, 2025
USD ($)
pools
Aug. 31, 2024
USD ($)
Aug. 31, 2023
USD ($)
Class of Stock [Line Items]      
Estimated patronage refunds $ (30,000) $ (300,000) $ (365,000)
Cash patronage dividends payable $ (300,358) (366,012) (503,057)
Patronage source earnings, percentage allocated to reserves 35.00%    
Capital equity certificates, number of pools | pools 2    
Equity redemptions, age 70 years    
Redemptions of equities $ 287,683 355,925 495,790
Preferred stock dividends paid (168,668) (168,668) (168,668)
Estimated Cash Patronage Dividends Payable 30,000    
futurePaymentsForRepurchaseOfOtherEquity (90,000)    
Total Patronage refunds, estimated 229,100    
nonqualified patronage, estimated 144,100    
Total patronage refunds 229,100    
Class B, Series 1 Preferred Stock [Member]      
Class of Stock [Line Items]      
Preferred Stock, Redemption Amount 536,500    
Capital Reserves      
Class of Stock [Line Items]      
Estimated patronage refunds (229,134) (659,693) (1,240,284)
Nonqualified Equity Certificates      
Class of Stock [Line Items]      
Estimated patronage refunds 144,101 282,431 169,159
Qualified Equity Certificates      
Class of Stock [Line Items]      
Estimated patronage refunds 55,000    
Capital Equity Certificates      
Class of Stock [Line Items]      
Estimated patronage refunds $ 55,033 $ 77,262 $ (706,125)