Annual report pursuant to Section 13 and 15(d)

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

v3.5.0.2
Summary of Significant Accounting Policies - Equity Method Investments and Variable Interest Entities (Details)
$ in Thousands
1 Months Ended 12 Months Ended
May 31, 2010
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Schedule of Equity Method Investments [Line Items]        
Limited partner equity interest (as a percent) (at least)   50.00%    
Share of distributions   $ 171 $ 675 $ 3,814
Interest and Investment, Net        
Schedule of Equity Method Investments [Line Items]        
Net investment income   $ 103 $ (57) $ (163)
Magnolia        
Schedule of Equity Method Investments [Line Items]        
Limited partner equity interest (as a percent) (at least) 39.00%      
Investment amount $ 12,150      
Minimum percentage of certificate face amount 0.05      
Acquisition fee (as a percent) 0.01