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Accrued Expenses and Other Liabilities -Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
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Accrued Liabilities And Other Liabilities [Abstract] |  |
Compensation | $ 37,121 | $ 37,960
Sales and other taxes payable | 11,621 | 14,688
Professional fees | 3,974 | 2,458
Cost of revenue related liabilities | 3,946 | 3,683
Interest payable | 622 | 2,703
Other | 3,671 | 4,586
Total | $ 60,955 | $ 66,078

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