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Operating Leases (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2020
Leases [Abstract] |  |  |
Rental expense | $ 5,800 | $ 4,800 |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
2021 |  |  | $ 4,604
2022 |  |  | 3,743
2023 |  |  | 2,933
2024 |  |  | 1,818
2025 |  |  | 1,518
Thereafter |  |  | 2,791
Total lease payments |  |  | 17,407
Less: imputed interest |  |  | 2,074
Operating lease liabilities | $ 0 |  | $ 15,333

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