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Financial Assets and Liabilities - Short-term investments (Details) - USD ($) $ in Thousands | Jul. 31, 2021 | Oct. 31, 2020
--- | --- | ---
Cash Equivalents [Line Items] |  |  |  |  |
Cost |  | $ 144,758 |  |  |
Gross unrealized gains |  | 51 |  |  |
Gross unrealized losses less than 12 months |  | (36) |  |  |
Gross unrealized losses 12 months or longer |  | 0 |  |  |
Estimated fair value | [1] | 144,773 |  |  |
Cash equivalents |  |  |  |  |
Cash Equivalents [Line Items] |  |  |  |  |
Cost |  | 252,894 |  | $ 304,127 |
Gross unrealized gains |  | 0 |  | 0 |
Gross unrealized losses less than 12 months |  | (1) |  | 0 |
Gross unrealized losses 12 months or longer |  | 0 |  | 0 |
Estimated fair value |  | 252,893 | [1] | 304,127 | [2]
Cash equivalents | Money market funds |  |  |  |  |
Cash Equivalents [Line Items] |  |  |  |  |
Cost |  | 249,814 |  | 304,127 |
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 |  | 249,814 | [1] | $ 304,127 | [2]
Cash equivalents | Corporate debt securities |  |  |  |  |
Cash Equivalents [Line Items] |  |  |  |  |
Cost |  | 3,080 |  |  |
Gross unrealized gains |  | 0 |  |  |
Gross unrealized losses less than 12 months |  | (1) |  |  |
Gross unrealized losses 12 months or longer |  | 0 |  |  |
Estimated fair value | [1] | 3,079 |  |  |
Short-term investments | Corporate debt securities |  |  |  |  |
Cash Equivalents [Line Items] |  |  |  |  |
Cost |  | 100,308 |  |  |
Gross unrealized gains |  | 38 |  |  |
Gross unrealized losses less than 12 months |  | (28) |  |  |
Gross unrealized losses 12 months or longer |  | 0 |  |  |
Estimated fair value | [1] | 100,318 |  |  |
Short-term investments | U.S. government agency & T-bills |  |  |  |  |
Cash Equivalents [Line Items] |  |  |  |  |
Cost |  | 7,745 |  |  |
Gross unrealized gains |  | 2 |  |  |
Gross unrealized losses less than 12 months |  | 0 |  |  |
Gross unrealized losses 12 months or longer |  | 0 |  |  |
Estimated fair value | [1] | 7,747 |  |  |
Short-term investments | Municipal bonds |  |  |  |  |
Cash Equivalents [Line Items] |  |  |  |  |
Cost |  | 2,465 |  |  |
Gross unrealized gains |  | 1 |  |  |
Gross unrealized losses less than 12 months |  | 0 |  |  |
Gross unrealized losses 12 months or longer |  | 0 |  |  |
Estimated fair value | [1] | 2,466 |  |  |
Short-term investments | Asset-backed securities |  |  |  |  |
Cash Equivalents [Line Items] |  |  |  |  |
Cost |  | 33,502 |  |  |
Gross unrealized gains |  | 10 |  |  |
Gross unrealized losses less than 12 months |  | (7) |  |  |
Gross unrealized losses 12 months or longer |  | 0 |  |  |
Estimated fair value | [1] | 33,505 |  |  |
Short-term investments | Others |  |  |  |  |
Cash Equivalents [Line Items] |  |  |  |  |
Cost |  | 738 |  |  |
Gross unrealized gains |  | 0 |  |  |
Gross unrealized losses less than 12 months |  | (1) |  |  |
Gross unrealized losses 12 months or longer |  | 0 |  |  |
Estimated fair value | [1] | $ 737 |  |  |
[1] | See Note 7. Fair Value Measures for further discussion on fair values of cash equivalents and short-term investments.
[2] | See Note 7. Fair Value Measures for further discussion on fair values of cash equivalents.

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