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Property and Equipment, Net - Components of Property and Equipment, Net (Detail) - USD ($) $ in Thousands		Sep. 30, 2025	Sep. 30, 2024
Property and Equipment, Net [Line Items]
Property and equipment, gross		$ 2,043,352	$ 2,009,806
Less accumulated depreciation		(1,274,795)	(1,254,205)
Property and equipment, net	[1]	768,557	755,601
Computers, Related Equipment and Software [Member]
Property and Equipment, Net [Line Items]
Property and equipment, gross		1,379,501	1,317,993
Building, Building Improvements And Land [Member]
Property and Equipment, Net [Line Items]
Property and equipment, gross		414,062	413,735
Leasehold Improvements [Member]
Property and Equipment, Net [Line Items]
Property and equipment, gross		189,236	214,319
Furniture, Fixtures and Other [Member]
Property and Equipment, Net [Line Items]
Property and equipment, gross		$ 60,553	$ 63,759
[1] Property and equipment, net.

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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, 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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