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Income Taxes - Effective Income Tax Rate Varied from Statutory Guernsey Tax Rate (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
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	$ 9,564
Tax benefit resulting from the release of valuation allowances on deferred tax assets	$ 15,438	12,650	12,032
Lapse of statute of limitations	2,968	25,162	18,022
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	$ 28,795	$ 28,795

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Income Tax Expense Benefit Undistributed Foreign Earnings Not Reinvested

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Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
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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.

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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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 investment tax credit.

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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 foreign income tax settlement.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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