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Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Property and equipment
Property and equipment, gross	$ 1,046,900	$ 1,090,000
Accumulated depreciation and amortization	(665,200)	(684,400)
Property and equipment, net	381,672	405,605
Depreciation expense	163,400	137,500	$ 125,500
Building and land
Property and equipment
Property and equipment, gross	11,500	11,200
Leasehold improvements
Property and equipment
Property and equipment, gross	343,200	363,500
Computer systems and equipment
Property and equipment
Property and equipment, gross	557,400	582,300
Furniture and fixtures
Property and equipment
Property and equipment, gross	$ 134,800	$ 133,000

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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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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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