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Property and Equipment, Net - Components of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Property and Equipment [Line Items]
Property and equipment, gross	$ 1,391,937	$ 1,247,530
Less accumulated depreciation	(895,352)	(891,845)
Property and equipment, net	496,585	355,685
Computers, Related Equipment and Software [Member]
Property and Equipment [Line Items]
Property and equipment, gross	1,027,825	978,040
Building and Land [Member]
Property and Equipment [Line Items]
Property and equipment, gross	97,782
Leasehold Improvements [Member]
Property and Equipment [Line Items]
Property and equipment, gross	222,812	213,166
Furniture, Fixtures and Other [Member]
Property and Equipment [Line Items]
Property and equipment, gross	$ 43,518	$ 56,324

X

- Definition

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

+ References

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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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