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Property and Equipment, Net - Components of Property and Equipment, Net (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Property and Equipment, Net [Line Items] |  |  |
Property and equipment, gross |  | $ 1,973,418 | $ 1,923,337
Less accumulated depreciation |  | (1,182,495) | (1,129,050)
Property and equipment, net |  | 790,923 | 794,287
Computers, Related Equipment and Software [Member] |  |  |
Property and Equipment, Net [Line Items] |  |  |
Property and equipment, gross |  | 1,294,574 | 1,267,230
Building, Building Improvements And Land [Member] |  |  |
Property and Equipment, Net [Line Items] |  |  |
Property and equipment, gross | [1] | 410,644 | 392,110
Leasehold Improvements [Member] |  |  |
Property and Equipment, Net [Line Items] |  |  |
Property and equipment, gross |  | 204,054 | 199,972
Furniture, Fixtures and Other [Member] |  |  |
Property and Equipment, Net [Line Items] |  |  |
Property and equipment, gross |  | $ 64,146 | $ 64,025
[1] | During fiscal year 2023, the Company occupied the campus in Ra'anana Israel and started the depreciation of the building and building improvements, please see also Note 2.

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