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Accrued Expenses and Other Liabilities -Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Accrued Liabilities And Other Liabilities [Abstract]    
Compensation $ 28,821 $ 37,960
Cost of revenue related liabilities 3,155 3,683
Sales and other taxes payable 14,656 14,688
Professional fees 2,771 2,458
Interest payable 2,068 2,703
Other 3,571 4,586
Total $ 55,042 $ 66,078