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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, 2021 | Sep. 30, 2020 | Sep. 30, 2019
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 | $ 7,701 | $ 47,582 |
Tax benefit primarily attributable to expiration of periods set forth in statutes of limitations and conclusions of tax audits related to unrecognized tax benefits |  |  | $ 26,529
Tax benefit resulting from the release of valuation allowances on deferred tax assets | 6,006 | 15,438 | $ 12,650
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 | $ 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 |

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- Definition Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(1)(Note 1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319 + Details
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