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Notes Payable and Long-Term Debt - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Aug. 31, 2020
Aug. 14, 2020
Debt Instrument [Line Items]            
Interest expense $ 28,855 $ 33,411 $ 53,900 $ 68,400    
Capitalized interest 2,100 3,400 4,200 6,200    
Interest Expense 28,855 $ 33,411 53,905 $ 68,382    
Principal Amount Outstanding of Loans Held-in-portfolio 538,000   538,000      
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 1,300,000   1,300,000   $ 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