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Tax Loss and Credit Carryforwards Available to Offset Future Income Tax Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Oct. 31, 2013
Federal
 
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Net operating loss carryforward $ 137,576
Credit carryforward 117,257
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 2030
Credit carryforward, expiration date 2033
Foreign Tax Credit Used in Domestic Country
 
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward 6,654
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 2021
California Research
 
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward 112,167
Credit carryforward, expiration date Indefinite
Other State Research
 
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward 8,079
Other State Research | Minimum
 
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward, expiration date 2014
Other State Research | Maximum
 
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward, expiration date 2032
State Net
 
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Net operating loss carryforward $ 164,385
State Net | Minimum
 
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Net operating loss carryforward, expiration date 2014
State Net | Maximum
 
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Net operating loss carryforward, expiration date 2031