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Investment in Unconsolidated Affiliate (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Schedule of Equity Method Investments [Line Items]              
Investment in Unconsolidated Affiliate $ 4,984 $ 3,946 $ 4,984 $ 3,946 $ 3,986 $ 3,903  
Investment in unconsolidated affiliates     1,000 0      
Equity in earnings of unconsolidated affiliates 104 136 239 254      
Return of capital contribution from unconsolidated affiliate     (240) (228)      
Equity interest in investee's unrealized gains on hedging derivatives, net of taxes 0 $ 6 (1) $ 17      
Investment in JV [Member]              
Schedule of Equity Method Investments [Line Items]              
Investment in Unconsolidated Affiliate $ 4,010   $ 4,010   $ 3,986    
Investment in Unconsolidated Affiliate, Ownership Percentage 27.972%   27.972%   27.972%   27.972%
Investment in Pro Mech [Member]              
Schedule of Equity Method Investments [Line Items]              
Investment in Unconsolidated Affiliate $ 974   $ 974   $ 0    
Investment in Unconsolidated Affiliate, Ownership Percentage 25.00%   25.00%   0.00%    
Investment in unconsolidated affiliates     $ 700