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Notes Payable and Long-Term Debt - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 31, 2023
May 31, 2022
May 31, 2023
May 31, 2022
Jul. 11, 2023
Jan. 24, 2023
Aug. 31, 2022
Debt Instrument [Line Items]              
Interest expense $ 36,949 $ 32,099 $ 106,166 $ 80,705      
Capitalized interest 4,100 900 9,800 4,700      
Interest Expense 36,949 $ 32,099 106,166 $ 80,705      
Principal Amount Outstanding of Loans Held-in-portfolio 1,000,000   1,000,000        
Long-term Debt 1,814,854   1,814,854       $ 1,668,209
Debt, Weighted Average Interest Rate           5.68%  
Subsequent Event              
Debt Instrument [Line Items]              
RepurchaseFacility         $ 200,000    
Five-Year Revolving Facilities | Line of Credit | Revolving credit facility              
Debt Instrument [Line Items]              
Current borrowing capacity 2,800,000   2,800,000        
Outstanding balance 0   0       0
Repurchase Facility | Subordinated Debt              
Debt Instrument [Line Items]              
Outstanding balance 0   0       0
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       366,000
committed              
Debt Instrument [Line Items]              
maximum availability under securitization 850,000   850,000        
uncommitted              
Debt Instrument [Line Items]              
maximum availability under securitization 250,000   250,000        
loan amount utilized              
Debt Instrument [Line Items]              
Principal Amount Outstanding of Loans Held-in-portfolio 0   0        
Private Placement              
Debt Instrument [Line Items]              
Long-term Debt $ 1,543,000   $ 1,543,000     $ 150,000 $ 1,545,000