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Summary Of Significant Accounting Policies - Property And Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Property, Plant and Equipment [Line Items]
Computer equipment	$ 206,861	$ 189,555
Capitalized Computer Software, Gross	71,690	78,184
Office furniture and equipment	44,776	44,525
Leasehold improvements	186,179	185,225
Property and equipment, gross	509,506	497,489
Accumulated depreciation and amortization	(358,563)	(327,067)
Property, Plant and Equipment, Net	$ 150,943	$ 170,422
Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years

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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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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