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Leases - Disclosure of Lease Cost (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Lease, Cost [Abstract] |  |  |  |
Total net lease cost | [1],[2] | $ 64,696 | $ 107,883 | $ 97,169
[1] | The lease cost includes immaterial amounts of lease income. The decline in net lease cost for the fiscal year 2023, compared to both fiscal years 2022 and 2021, is primarily attributable to completion of the move during fiscal year 2023 from leased facilities in Ra’anana Israel to the Company owned facilities, leading to a change from primarily lease costs to other expenses, including depreciation and operational costs.
[2] | Variable lease cost is immaterial.

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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