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Intangible Assets - Future Amortization (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Future expected amortization of intangible assets      
2017 $ 1,073    
2018 281    
2019 207    
2020 957    
2021 and after 132    
Total 2,650 $ 4,051  
Amortization expense $ 1,400 $ 3,100 $ 11,000