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Commitments and Contingencies - Lease Commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Operating Leased Assets [Line Items]      
Operating lease expense $ 7,100    
Rent expense   $ 5,400 $ 5,400
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2021 5,441    
2022 4,764    
2023 4,212    
2024 3,406    
2025 and thereafter 7,832    
Total undiscounted lease payments $ 25,655    
Minimum      
Operating Leased Assets [Line Items]      
Operating leases, renewal term 1 year    
Maximum      
Operating Leased Assets [Line Items]      
Operating leases, renewal term 15 years