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Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Leases [Abstract]      
Rental expense $ 4,700 $ 5,200 $ 5,400
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2017 3,982    
2018 3,177    
2019 2,401    
2020 1,616    
2021 1,072    
Thereafter 404    
Total $ 12,652