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Leases - Future Maturities of Operating Lease Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]    
2022 $ 8,031  
2023 6,791  
2024 4,816  
2025 3,706  
2026 3,205  
2026 and future years 6,132  
Total future lease payments 32,681  
Less: Imputed interest 1,946  
Operating lease liability $ 30,735 $ 32,480