Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Equity Method Investments and Variable Interest Entities (Details)

v3.10.0.1
Summary of Significant Accounting Policies - Equity Method Investments and Variable Interest Entities (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2010
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]          
Limited partner equity interest (as a percent)     50.00%    
Net investment gain (loss) recognized     $ 8 $ (202) $ (103)
Share of distributions   $ 171 $ 25 $ 324  
Magnolia          
Schedule of Equity Method Investments [Line Items]          
Limited partner equity interest (as a percent) 39.00%        
Investment amount $ 12,150        
Minimum percentage of certificate face amount 0.05        
Acquisition fee (as a percent) 0.01