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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, 2015	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Lapse of statute of limitations	$ 17,232	$ 18,709	$ 29,786
Tax benefit, settlement	7,594	$ 14,557
Net benefit from release of valuation allowances on deferred tax assets	22,895
Provision for uncertain foreign tax position	$ 6,000
Unrecognized tax benefits, statute of limitations expiry period	2015	2014	2013

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Unrecognized Tax Benefits Reduction Resulting From Lapse Of Applicable Statute Of Limitations Expiration Period

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6510177

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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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