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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, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Net benefit from reduction of taxes payable		$ 11,037
Lapse of statute of limitations	$ 18,022	28,774	$ 4,606
Tax benefit, settlement	9,564	9,450
Net benefit from release of valuation allowances on deferred tax assets	12,032	$ (12,754)
Provisional expense due to US tax law change	2,321
Provisional tax liability related to tax implications of retaining earnings	4,059
Tax benefit	$ 28,795

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Income Tax Expense Benefit Undistributed Foreign Earnings Not Reinvested

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Income tax reconciliation foreign tax benefit from reduction of taxes payable.

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

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