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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, 2016
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]      
Lapse of statute of limitations $ 4,606 $ 17,232 $ 18,709
Tax benefit, settlement 15,264 7,594  
Net benefit from release of valuation allowances on deferred tax assets 15,651 22,895  
Foreign tax benefit from tax provision of non-taxable internal capital gain recognized 19,963    
Provisions for uncertain foreign tax positions $ 23,597 $ 6,000  
Unrecognized tax benefits, statute of limitations expiry period 2016 2015