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Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Leases [Abstract]      
Rental expense $ 5,800 $ 4,800 $ 4,900
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2020 4,749    
2021 4,537    
2022 3,644    
2023 2,853    
2024 1,818    
Thereafter 2,551    
Total $ 20,152