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Notes Payable and Long-Term Debt - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Aug. 31, 2020
Aug. 14, 2020
Debt Instrument [Line Items]            
Interest expense $ 28,992 $ 26,661 $ 82,900 $ 95,000    
Capitalized interest 3,900 2,700 6,000 8,900    
Interest Expense 28,992 $ 26,661 82,897 $ 95,043    
Principal Amount Outstanding of Loans Held-in-portfolio 600,000   600,000      
increase to maximum availability under securitization 600,000   $ 600,000      
maximum availability under securitization         $ 500,000  
Notes Purchase Agreement           $ 375,000
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 1,200,000   1,200,000   $ 345,000  
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