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Income Taxes - Tax Loss and Credit Carryforwards Available to Offset Future Income Tax Liabilities (Detail)
$ in Thousands
Oct. 31, 2018
USD ($)
Federal  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Net operating loss carryforward $ 139,526
Credit carryforward 109,760
Federal foreign tax credit carryforward  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward 2,427
International foreign tax credit carryforward  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward 12,943
California research credit carryforward  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward 188,826
Other state research credit carryforward  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Credit carryforward 10,873
State net operating loss carryforward  
Net Operating Loss and Tax Credit Carryforward [Line Items]  
Net operating loss carryforward $ 104,174