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Income Taxes - Effective Income Tax Rate Varied from Statutory Guernsey Tax Rate (Detail)			12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Statutory Guernsey tax rate	21.00%	35.00%	0.00%	0.00%	0.00%
Foreign taxes (percentage)			15.90%	14.80%	15.50%
Effective income tax rate			15.90%	14.80%	15.50%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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- Definition

Percentage 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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

+ References

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