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Property and Equipment, Net - Components of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Property and Equipment, Net [Line Items]
Property and equipment, gross	$ 1,497,541	$ 1,391,937
Less accumulated depreciation	(972,227)	(895,352)
Property and equipment, net	525,314	496,585
Computers, Related Equipment and Software [Member]
Property and Equipment, Net [Line Items]
Property and equipment, gross	1,109,465	1,027,825
Building and Land [Member]
Property and Equipment, Net [Line Items]
Property and equipment, gross	109,446	97,782
Leasehold Improvements [Member]
Property and Equipment, Net [Line Items]
Property and equipment, gross	230,817	222,812
Furniture, Fixtures and Other [Member]
Property and Equipment, Net [Line Items]
Property and equipment, gross	$ 47,813	$ 43,518

X

- Definition

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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