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Composition of Certain Financial Statement Captions - Property and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Property, Plant and Equipment [Line Items]    
Less: accumulated depreciation and amortization $ (88,001) $ (94,831)
Property and equipment, net 10,966 17,580
Technology Equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 69,928 76,335
Office Equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 12,296 14,790
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 16,743 $ 21,286