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Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Leases [Abstract]      
Rental expense $ 4,900 $ 4,700 $ 5,200
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2018 4,124    
2019 4,001    
2020 3,161    
2021 2,518    
2022 1,588    
Thereafter 831    
Total $ 16,223