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Financial Assets and Liabilities - Summary of Cash Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands | Oct. 31, 2018 | Oct. 31, 2017
--- | --- | ---
Cash equivalents: |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Available-for-sale Securities, Cost | $ 165,296 | $ 560,594
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 | 165,296 | 560,594
Other long-term assets: |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Non-marketable equity securities, Cost | 10,892 | 7,826
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 | 10,892 | 7,826
Money market funds | Cash equivalents: |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Available-for-sale Securities, Cost | 165,296 | 560,594
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 | 165,296 | 560,594
Non-marketable equity securities | Other long-term assets: |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Non-marketable equity securities, Cost | 10,892 | 7,826
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 | $ 10,892 | $ 7,826

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