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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, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |
Lapse of statute of limitations | $ 25,162 | $ 18,022 | $ 28,774
Tax benefit from release of gross unrecognized tax benefits | 26,529 | 9,564 |
Net (benefit) provisional expense from release of valuation allowances on deferred tax assets | $ (12,650) | 12,032 |
Provisional expense due to US tax law change |  | 2,321 |
Provisional tax liability related to tax implications of retaining earnings |  | 4,059 |
Tax benefit related to the release of withholding and income tax reserves for unremitting earnings |  | $ 28,795 |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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