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Long-term Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Sep. 30, 2015
Debt Instrument [Line Items]    
Deferred Financing Costs $ (386)  
Additional carrying value of restructured debt   $ 630
Total debt 28,614 32,654
Stated principal 28,614 32,024
ABE South Dakota [Member]    
Debt Instrument [Line Items]    
Restructuring fee   3,024
Deferred Financing Costs (386)  
Additional carrying value of restructured debt   630
Total debt $ 28,614 32,654
ABE South Dakota [Member] | Senior Debt Principal - Variable [Member]    
Debt Instrument [Line Items]    
Interest Rate variable 3.94%  
Total debt $ 29,000 $ 29,000