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Finance Receivables - Assessment of credit quality by creditworthiness (Details 4) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Contracts    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 456,135 $ 484,479
Chapter 13 bankruptcy accounts 3,901 4,204
Finance receivables, gross contract 460,036 488,683
Contracts | Performing accounts    
Financing Receivable, Recorded Investment [Line Items]    
Total 430,269 466,515
Contracts | Non-performing accounts    
Financing Receivable, Recorded Investment [Line Items]    
Total 25,866 17,964
Direct Loans    
Financing Receivable, Recorded Investment [Line Items]    
Total 10,566 11,088
Chapter 13 bankruptcy accounts 35 44
Finance receivables, gross contract 10,601 11,132
Direct Loans | Performing accounts    
Financing Receivable, Recorded Investment [Line Items]    
Total 10,290 10,930
Direct Loans | Non-performing accounts    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 276 $ 158