Income Taxes - Tax Loss and Credit Carryforwards Available to Offset Future Income Tax Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Oct. 31, 2014
Federal
Net Operating Loss and Tax Credit Carryforward [Line Items]
Net operating loss carryforward	162,289
Credit carryforward	126,649
Federal | Minimum
Net Operating Loss and Tax Credit Carryforward [Line Items]
Net operating loss carryforward, expiration date	2018
Credit carryforward, expiration date	2018
Federal | Maximum
Net Operating Loss and Tax Credit Carryforward [Line Items]
Net operating loss carryforward, expiration date	2033
Credit carryforward, expiration date	2034
Foreign Tax Credit Used in Domestic Country
Net Operating Loss and Tax Credit Carryforward [Line Items]
Credit carryforward	13,557
Foreign Tax Credit Used in Domestic Country | Minimum
Net Operating Loss and Tax Credit Carryforward [Line Items]
Credit carryforward, expiration date	2018
Foreign Tax Credit Used in Domestic Country | Maximum
Net Operating Loss and Tax Credit Carryforward [Line Items]
Credit carryforward, expiration date	2024
International Foreign
Net Operating Loss and Tax Credit Carryforward [Line Items]
Credit carryforward	10,429
Credit carryforward, expiration date	Indefinite
California Research
Net Operating Loss and Tax Credit Carryforward [Line Items]
Credit carryforward	131,069
Credit carryforward, expiration date	Indefinite
Other State Research
Net Operating Loss and Tax Credit Carryforward [Line Items]
Credit carryforward	8,074
Other State Research | Minimum
Net Operating Loss and Tax Credit Carryforward [Line Items]
Credit carryforward, expiration date	2015
Other State Research | Maximum
Net Operating Loss and Tax Credit Carryforward [Line Items]
Credit carryforward, expiration date	2034
State Net
Net Operating Loss and Tax Credit Carryforward [Line Items]
Net operating loss carryforward	159,496
State Net | Minimum
Net Operating Loss and Tax Credit Carryforward [Line Items]
Net operating loss carryforward, expiration date	2015
State Net | Maximum
Net Operating Loss and Tax Credit Carryforward [Line Items]
Net operating loss carryforward, expiration date	2033