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Notes Payable and Long-Term Debt - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 31, 2022
May 31, 2021
May 31, 2022
May 31, 2021
Aug. 31, 2021
Debt Instrument [Line Items]          
Interest expense $ 32,099 $ 28,992 $ 80,705 $ 82,897  
Capitalized interest 900 3,900 4,700 6,000  
Interest Expense 32,099 $ 28,992 80,705 $ 82,897  
Principal Amount Outstanding of Loans Held-in-portfolio 950,000   950,000    
Long-term Debt 1,800,779   $ 1,800,779   $ 1,579,911
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   $ 2,750,000    
Outstanding balance         0
Repurchase Facility | Subordinated Debt          
Debt Instrument [Line Items]          
Outstanding balance 150,000   150,000    
Maximum borrowing capacity 150,000   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   $ 0
committed          
Debt Instrument [Line Items]          
maximum availability under securitization 700,000   700,000    
uncommitted          
Debt Instrument [Line Items]          
maximum availability under securitization $ 250,000   $ 250,000