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Notes Payable and Long-Term Debt - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2022
Nov. 30, 2021
Aug. 31, 2022
Debt Instrument [Line Items]      
Interest expense $ 33,250 $ 23,432  
Capitalized interest 2,500 2,300  
Interest Expense 33,250 $ 23,432  
Principal Amount Outstanding of Loans Held-in-portfolio 929,000    
Long-term Debt $ 1,668,158   $ 1,668,209
Five-Year Revolving Facilities | Line of Credit | Revolving credit facility      
Debt Instrument [Line Items]      
Debt instrument, term 5 years    
Current borrowing capacity $ 2,750,000    
Outstanding balance     0
Repurchase Facility | Subordinated Debt      
Debt Instrument [Line Items]      
Outstanding balance 0    
Maximum borrowing capacity 150,000    
Term loans from cooperatives and other banks, 430K payable in 2025 | Unsecured Debt      
Debt Instrument [Line Items]      
Long-term Debt 366,000   $ 366,000
committed      
Debt Instrument [Line Items]      
maximum availability under securitization 850,000    
uncommitted      
Debt Instrument [Line Items]      
maximum availability under securitization $ 250,000