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Debt Obligations - Junior Subordinated Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Debt Instrument [Line Items]          
Deferred financing costs $ 7,040   $ 7,040   $ 6,727
Junior subordinated notes          
Debt Instrument [Line Items]          
Total debt obligations 37,400   37,400   37,400
Deferred financing costs 367   367   $ 382
Interest expense $ 386 $ 300 $ 1,058 $ 862  
London Interbank Offered Rate (LIBOR) | Junior subordinated notes          
Debt Instrument [Line Items]          
Basis spread on variable rate     2.00%    
Interest rate 4.36%   4.36%