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Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Property and equipment
Property and equipment, gross	$ 1,061,200	$ 1,154,400
Accumulated depreciation and amortization	(706,800)	(771,800)
Property and equipment, net	354,377	382,638
Depreciation expense	152,300	152,300	$ 147,000
Building and land
Property and equipment
Property and equipment, gross	10,100	10,400
Leasehold improvements
Property and equipment
Property and equipment, gross	299,300	329,400
Computer systems and equipment
Property and equipment
Property and equipment, gross	659,600	716,700
Furniture and fixtures
Property and equipment
Property and equipment, gross	$ 92,200	$ 97,900

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