Financial Assets and Liabilities - Summary of Cash Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands	Oct. 31, 2019	Oct. 31, 2018
Cash equivalents:
Cash, Cash Equivalents and Investments [Line Items]
Available-for-sale Securities, Cost	$ 166,024	$ 165,296
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	166,024	165,296
Other long-term assets:
Cash, Cash Equivalents and Investments [Line Items]
Non-marketable equity securities, Cost	10,951	10,892
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	10,951	10,892
Money market funds | Cash equivalents:
Cash, Cash Equivalents and Investments [Line Items]
Available-for-sale Securities, Cost	166,024	165,296
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	166,024	165,296
Non-marketable equity securities | Other long-term assets:
Cash, Cash Equivalents and Investments [Line Items]
Non-marketable equity securities, Cost	10,951	10,892
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	$ 10,951	$ 10,892