Financial Assets and Liabilities - Summary of Cash Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands		Oct. 31, 2020	Oct. 31, 2019
Cash equivalents:
Cash, Cash Equivalents and Investments [Line Items]
Cost		$ 304,127	$ 166,024
Gross Unrealized Gains		0	0
Gross Unrealized Losses Less than 12 Months		0	0
Gross Unrealized Losses 12 Months or Longer		0	0
Estimated Fair Value	[1]	304,127	166,024
Other long-term assets:
Cash, Cash Equivalents and Investments [Line Items]
Non-marketable equity securities, Cost		13,200	10,951
Gross Unrealized Gains		0	0
Gross Unrealized Losses Less Than 12Months		0	0
Gross Unrealized Loss Position 12Months Or Longer		0	0
Non-marketable equity securities	[1]	13,200	10,951
Money market funds | Cash equivalents:
Cash, Cash Equivalents and Investments [Line Items]
Cost		304,127	166,024
Gross Unrealized Gains		0	0
Gross Unrealized Losses Less than 12 Months		0	0
Gross Unrealized Losses 12 Months or Longer		0	0
Estimated Fair Value	[1]	304,127	166,024
Non-marketable equity securities | Other long-term assets:
Cash, Cash Equivalents and Investments [Line Items]
Non-marketable equity securities, Cost		13,200	10,951
Gross Unrealized Gains		0	0
Gross Unrealized Losses Less Than 12Months		0	0
Gross Unrealized Loss Position 12Months Or Longer		0	0
Non-marketable equity securities	[1]	$ 13,200	$ 10,951

[1] See Note 7. Fair Value Measures for further discussion on fair values of cash equivalents.