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Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Property and equipment
Property and equipment, gross	$ 1,080,400	$ 1,046,900
Accumulated depreciation and amortization	(681,500)	(665,200)
Property and equipment, net	398,876	381,672
Depreciation expense	143,600	163,400	$ 137,500
Building and land
Property and equipment
Property and equipment, gross	14,400	11,500
Leasehold improvements
Property and equipment
Property and equipment, gross	351,200	343,200
Computer systems and equipment
Property and equipment
Property and equipment, gross	602,100	557,400
Furniture and fixtures
Property and equipment
Property and equipment, gross	$ 112,700	$ 134,800

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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