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Notes Payable and Long-Term Debt - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Aug. 31, 2020
Aug. 14, 2020
Debt Instrument [Line Items]        
Interest expense $ 25,050 $ 34,971    
Capitalized interest 2,100 2,800    
Interest Expense 25,050 $ 34,971    
Principal Amount Outstanding of Loans Held-in-portfolio 456,000      
increase to maximum availability under securitization $ 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      
Outstanding balance 527,000   $ 345,000  
Repurchase Facility | Subordinated Debt        
Debt Instrument [Line Items]        
Outstanding balance 150,000      
Maximum borrowing capacity $ 150,000