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Acquisition Activity - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Aug. 05, 2016
Aug. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Business Acquisition [Line Items]          
Goodwill     $ 2,295 $ 0  
Cash consideration     2,479 $ 0 $ 0
Tremont Realty Capital LLC          
Business Acquisition [Line Items]          
Goodwill $ 2,295        
Contingent consideration (1,270) $ (1,270) $ (1,257)    
Working capital 291        
Cash consideration $ 2,466 $ 2,466      
Customer relationships | Tremont Realty Capital LLC          
Business Acquisition [Line Items]          
Finite lived assets, useful life (in years) 9 years 7 months 21 days        
Customer relationships $ 1,150