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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2025
Income Taxes [Line Items] |
Provision (benefit) for Income Taxes | The provision (benefit) f or income taxes consists of the following:
|  | Year Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Current |  | $ | 105,182 |  |  | $ | 140,423 |  |  | $ | 153,611 |
Deferred |  |  | 20,291 |  |  |  | (45,673 | ) |  |  | (60,212 | )
Income taxes |  | $ | 125,473 |  |  | $ | 94,750 |  |  | $ | 93,399 |
Components of Deferred Tax Assets and Liabilities | Deferred income taxes are comprised of the following components:
|  | As of September 30, |
|  | 2025 |  |  | 2024 |
Deferred tax assets: |  |  |  |  |  |
Deferred revenue |  | $ | 20,813 |  |  | $ | 24,507 |
Employee compensation and benefits |  |  | 114,122 |  |  |  | 113,431 |
Intangible assets and computer software |  |  | 40,208 |  |  |  | 50,564 |
Tax credits, net capital and operating loss carryforwards |  |  | 145,525 |  |  |  | 170,591 |
Lease liabilities |  |  | 51,644 |  |  |  | 37,130 |
Other |  |  | 79,822 |  |  |  | 76,908 |
Total deferred tax assets |  |  | 452,134 |  |  |  | 473,131 |
Valuation allowances |  |  | (63,213 | ) |  |  | (61,513 | )
Total deferred tax assets, net |  |  | 388,921 |  |  |  | 411,618 |
Deferred tax liabilities: |  |  |  |  |  |
Anticipated withholdings on subsidiaries’ earnings |  |  | (15,802 | ) |  |  | (33,339 | )
Intangible assets and computer software |  |  | (114,511 | ) |  |  | (116,966 | )
Lease assets |  |  | (47,305 | ) |  |  | (33,215 | )
Other |  |  | (55,016 | ) |  |  | (46,780 | )
Total deferred tax liabilities |  |  | (232,634 | ) |  |  | (230,300 | )
Net deferred tax assets |  | $ | 156,287 |  |  | $ | 181,318 |
Aggregate Changes in Balance of Company's Gross Unrecognized Tax Benefits | The aggregate changes in the balance of the Company’s gross unrecognized tax benefits were as follows:
|  | Year Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Balance at beginning of fiscal year |  | $ | 151,822 |  |  | $ | 196,949 |  |  | $ | 213,031 |
Additions based on tax positions related to the current year |  |  | 23,112 |  |  |  | 23,267 |  |  |  | 22,181 |
Additions for tax positions of prior years |  |  | 22,751 |  |  |  | 15,840 |  |  |  | 18,477 |
Reductions for tax positions of prior years |  |  | (3,486 | ) |  |  | (4,613 | ) |  |  | (16,096 | )
Settlements with tax authorities(1) |  |  | (7,040 | ) |  |  | (48,622 | ) |  |  | (27,737 | )
Lapse of statute of limitations |  |  | (16,627 | ) |  |  | (30,999 | ) |  |  | (12,907 | )
Balance at end of fiscal year |  | $ | 170,532 |  |  | $ | 151,822 |  |  | $ | 196,949 |
(1) The changes in the years ended September 30, 2024 and 2023 were $48,622 and $27,737 respectively, the majority of which were offset by income tax payments or changes in tax receivables and tax payables.
Guernsey Tax Rate [Member] |
Income Taxes [Line Items] |
Effective Income Tax Rate Varied from Statutory Guernsey Tax Rate | The effective income tax rate varied from the statutory Guernsey tax rate as follows:
|  | Year Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Statutory Guernsey tax rate |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Foreign taxes(1) |  |  | 18.1 |  |  |  | 16.0 |  |  |  | 14.7 |
Effective income tax rate |  |  | 18.1 | % |  |  | 16.0 | % |  |  | 14.7 | %
(1) Foreign taxes for the year ended Sep 30, 2025: In fiscal year 2025, the Company recorded a tax benefit of $18,504 related to the release of prior periods accrued withholding taxes on unremitted earnings accumulated in a certain jurisdiction. The release of the accrued withholding taxes followed the Company’s funding decisions relating to an investment allocation priorities. Foreign taxes in fiscal year 2025 also included a benefit of $26,842 relating primarily to release of unrecognized tax benefits due to expiration of the periods set forth in statutes of limitations in certain jurisdictions, due to settlements with tax authorities and updated estimations in certain jurisdictions. (1) Foreign taxes for the year ended Sep 30, 2024: In fiscal year 2024, foreign taxes included a total amount of releases of gross unrecognized tax benefits of $81,556, relating primarily to settlements of tax audits, and expiration of the periods set forth in statutes of limitations in certain jurisdictions. Part of the releases amount was offset by an increase in taxes payables, and tax payments, and, as a result, a net benefit of $47,770 was included within income tax expense for fiscal year 2024. Foreign taxes in fiscal year 2024 also included a recognition of tax benefit of $17,465 resulting from a creation of a deferred tax asset due to a change in measurement following a tax ruling in a certain jurisdiction in which the Company operates. (1) Foreign taxes for the year ended Sep 30, 2023: In fiscal year 2023, the Company recorded a tax benefit of $22,700 related to the release of accrued withholding taxes on unremitted earnings accumulated in Israel. The release of the accrued withholding taxes followed the Company’s funding relating to the acquisition of TEOCO’s service assurance business and the construction of its Israeli campus. Foreign taxes in fiscal year 2023 a lso included a benefit of $40,644 relating to release of gross unrecognized tax benefits due to settlements of tax audits and expiration of the periods set forth in statutes of limitations in certain jurisdictions. The majority of the release was offset by tax payments and, as a result, a net benefit of $16,232 was included within income tax expense for fiscal year 2023. Foreign taxes in fiscal year 2023 also included a recognition of tax benefit of $11,566 resulting from internal structural changes in certain jurisdictions in which the Company operates, a benefit of $9,236 due to a change in measurement of a deferred tax liability following a regulatory clarification, and a benefit of $3,142 relating to changes in tax regulations in certain jurisdictions. As previously disclosed in the Company’s Annual Report on Form 20-F for fiscal year 2022, the Company's primary Israeli subsidiary has elected, during fiscal year 2022, to pay the reduced corporate tax on all of its “previously exempt earnings” based on a temporary order of the Israeli budget law. Following this election, payment of this tax, was made during fiscal year 2023. The impact of this election on income taxes was already reflected in fiscal year 2022.

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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