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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015 Segment	Apr. 30, 2014
Income Tax Contingency [Line Items]
Number of segments			4us-gaap_NumberOfOperatingSegments
Income tax expense	$ 3,728,000us-gaap_IncomeTaxExpenseBenefit	$ (443,000)us-gaap_IncomeTaxExpenseBenefit	$ 1,644,000us-gaap_IncomeTaxExpenseBenefit	$ (4,828,000)us-gaap_IncomeTaxExpenseBenefit
Liability for uncertain tax positions			12,000,000
Uncertain tax position liabilities excluding interest and penalties	11,000,000		11,000,000
Reasonably possible outcome within the next 12 months range, reduction of liability for unrecognized tax benefits excluding penalties and interest	10,000,000		10,000,000
Reasonably possible outcome within the next 12 months range, increase of liability for unrecognized tax benefits excluding penalties and interest	4,000,000		4,000,000
Foreign Tax Authority
Income Tax Contingency [Line Items]
Tax expense, other comprehensive income			4,000,000
Income tax expense			$ 6,000,000