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Accrued Expenses and Other Liabilities -Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Sep. 30, 2019
Accrued Liabilities And Other Liabilities [Abstract]    
Compensation $ 21,717 $ 13,031
Cost of revenue related liabilities 3,404 1,668
Sales and other taxes payable 5,981 219
Professional fees 3,660 3,863
Facilities related liabilities 68 273
Other 7,751 5,140
Total $ 42,581 $ 24,194