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DEBT OBLIGATIONS - 2020-VF1 Notes (Details) - Secured credit facilities - 2020-VF1 Notes - USD ($)
Sep. 30, 2021
Sep. 30, 2020
Debt Instrument [Line Items]    
Outstanding balance $ 10,400,000  
Advance Receivables Trust    
Debt Instrument [Line Items]    
Face amount   $ 130,000,000