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Property and Equipment - Components of Property and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Property, Plant and Equipment [Abstract]    
Computer hardware and software $ 364,762 $ 352,704
Furniture and fixtures 29,744 30,568
Leasehold improvements 95,383 94,959
Gross property and equipment 489,889 478,231
Accumulated depreciation and amortization (391,788) (377,994)
Net property and equipment $ 98,101 $ 100,237