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Income Taxes - Tax Loss and Credit Carryforwards Available to Offset Future Income Tax Liabilities (Detail)
$ in Thousands
 12 Months Ended
Oct. 31, 2015
USD ($)
Federal  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Net operating loss carryforward $ 108,533
Credit carryforward $ 120,243
Federal | Minimum  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Net operating loss carryforward, expiration date 2016
Credit carryforward, expiration date 2019
Federal | Maximum  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Net operating loss carryforward, expiration date 2034
Credit carryforward, expiration date 2035
Foreign Tax Credit Used in Domestic Country  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward $ 4,586
Foreign Tax Credit Used in Domestic Country | Minimum  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward, expiration date 2017
Foreign Tax Credit Used in Domestic Country | Maximum  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward, expiration date 2023
International Foreign  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward $ 10,104
Credit carryforward, expiration date Indefinite
California Research  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward $ 135,858
Credit carryforward, expiration date Indefinite
Other State Research  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward $ 5,395
Other State Research | Minimum  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward, expiration date 2016
Other State Research | Maximum  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward, expiration date 2030
State Net  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Net operating loss carryforward $ 217,914
State Net | Minimum  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Net operating loss carryforward, expiration date 2016
State Net | Maximum  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Net operating loss carryforward, expiration date 2035