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Income Taxes - Tax Loss and Credit Carryforwards Available to Offset Future Income Tax Liabilities (Detail) $ in Thousands	Oct. 31, 2016 USD ($)
Federal
Net Operating Loss and Tax Credit Carryforward [Line Items]
Net operating loss carryforward	$ 73,226
Credit carryforward	172,959
Foreign Tax Credit Used in Domestic Country
Net Operating Loss and Tax Credit Carryforward [Line Items]
Credit carryforward	2,946
International Foreign
Net Operating Loss and Tax Credit Carryforward [Line Items]
Credit carryforward	9,445
California Research
Net Operating Loss and Tax Credit Carryforward [Line Items]
Credit carryforward	160,442
Other State Research
Net Operating Loss and Tax Credit Carryforward [Line Items]
Credit carryforward	7,145
State Net
Net Operating Loss and Tax Credit Carryforward [Line Items]
Net operating loss carryforward	$ 36,735