Income Taxes - Tax Loss and Credit Carryforwards Available to Offset Future Income Tax Liabilities (Detail) $ in Thousands	Oct. 31, 2020 USD ($)
Federal
Net Operating Loss and Tax Credit Carryforward [Line Items]
Net operating loss carryforward	$ 41,757
Credit carryforward	176,616
Federal foreign tax credit carryforward
Net Operating Loss and Tax Credit Carryforward [Line Items]
Credit carryforward	1,921
International foreign tax credit carryforward
Net Operating Loss and Tax Credit Carryforward [Line Items]
Net operating loss carryforward	81,069
Credit carryforward	15,681
California research credit carryforward
Net Operating Loss and Tax Credit Carryforward [Line Items]
Credit carryforward	173,600
Other state research credit carryforward
Net Operating Loss and Tax Credit Carryforward [Line Items]
Credit carryforward	15,486
State net operating loss carryforward
Net Operating Loss and Tax Credit Carryforward [Line Items]
Net operating loss carryforward	$ 70,251