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Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Property and equipment
Property and equipment, gross	$ 1,154,400	$ 1,124,800
Accumulated depreciation and amortization	(771,800)	(696,600)
Property and equipment, net	382,638	428,239
Depreciation expense	152,300	147,000	$ 143,600
Building and land
Property and equipment
Property and equipment, gross	10,400	9,900
Leasehold improvements
Property and equipment
Property and equipment, gross	329,400	339,700
Computer systems and equipment
Property and equipment
Property and equipment, gross	716,700	672,100
Furniture and fixtures
Property and equipment
Property and equipment, gross	$ 97,900	$ 103,100

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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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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