Property and Equipment - Components of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Property Plant And Equipment [Abstract]
Computer hardware and software	$ 352,704	$ 330,392
Furniture and fixtures	30,568	30,251
Leasehold improvements	94,959	99,883
Gross property and equipment	478,231	460,526
Accumulated depreciation and amortization	(377,994)	(359,027)
Net property and equipment	$ 100,237	$ 101,499

Computer Hardware And Software, Gross

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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