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Income Taxes - Effective Income Tax Rate Varied from Statutory Guernsey Tax Rate (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Schedule Of Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Releases of gross unrecognized tax benefits related to settled arrangements with tax authorities, change in measurement of certain positions and expiration of periods set forth in statutes of limitations | $ 4,757 | $ 7,701 | $ 47,582
Tax (expense) benefit resulting from the release of valuation allowances on deferred tax assets | (1,211) | 6,006 | 15,438
Foreign tax benefit from internal structural changes |  | 10,933 |
Foreign tax expense for the estimated additional tax charge of gain from sale of a business | 3,193 | $ 39,596 |
Release of gross unrecognized tax benefits offset by a net benefit included within income tax expense |  |  | 14,971
Foreign tax benefit resulting from tax enactments related to COVID-19 |  |  | $ 4,964
Benefit of relating to changes in tax regulations in certain jurisdiction | 8,871 |  |
ISRAEL |  |  |
Schedule Of Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Tax benefit related to the release of accrued withholding taxes on unremitted earnings | $ 37,000 |  |

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