Annual report pursuant to Section 13 and 15(d)

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

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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 ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Schedule of Equity Method Investments [Line Items]        
Limited partner equity interest (as a percent)   50.00%    
Share of distributions   $ 675 $ 3,814 $ 1,179
Interest and Investment, Net        
Schedule of Equity Method Investments [Line Items]        
Net investment income   $ 57 $ 163 $ 658
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