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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, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Net benefit from reduction of taxes payable	$ 11,037
Lapse of statute of limitations	28,774	$ 4,606	$ 17,232
Tax benefit, settlement	9,450	15,264
Net benefit from release of valuation allowances on deferred tax assets	$ 12,754	15,651
Foreign tax benefit from tax provision of non-taxable internal capital gain recognized		19,963
Provisions for uncertain foreign tax positions		$ 23,597

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

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Income tax reconciliation foreign tax benefit from tax provision of non-taxable internal capital gain.

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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
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
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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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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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