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Financial Assets and Liabilities - Short-term investments (Details) - USD ($) $ in Thousands | Apr. 30, 2023 | Oct. 31, 2022
--- | --- | ---
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | $ 151,906 |  | $ 150,511 |
Gross Unrealized Gains | 115 |  | 7 |
Gross Unrealized Losses Less Than 12 Continuous Months | (323) |  | (1,082) |
Gross Unrealized Losses 12 Continuous Months or Longer | (852) |  | (1,523) |
Estimated fair value | 150,846 | [1] | 147,913 | [2]
Cash equivalents |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 73,611 |  | 77,683 |
Gross Unrealized Gains | 0 |  | 0 |
Gross Unrealized Losses Less Than 12 Continuous Months | 0 |  | 0 |
Gross Unrealized Losses 12 Continuous Months or Longer | 0 |  | 0 |
Estimated fair value | 73,611 | [1] | 77,683 | [2]
Cash equivalents | Money market funds |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 73,611 |  | 77,683 |
Gross Unrealized Gains | 0 |  | 0 |
Gross Unrealized Losses Less Than 12 Continuous Months | 0 |  | 0 |
Gross Unrealized Losses 12 Continuous Months or Longer | 0 |  | 0 |
Estimated fair value | 73,611 | [1] | 77,683 | [2]
Short-term investments | U.S. government agency & T-bills |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 20,922 |  | 25,816 |
Gross Unrealized Gains | 5 |  | 0 |
Gross Unrealized Losses Less Than 12 Continuous Months | (59) |  | (174) |
Gross Unrealized Losses 12 Continuous Months or Longer | 0 |  | (39) |
Estimated fair value | 20,868 | [1] | 25,603 | [2]
Short-term investments | Municipal bonds |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 1,965 |  | 2,970 |
Gross Unrealized Gains | 0 |  | 0 |
Gross Unrealized Losses Less Than 12 Continuous Months | 0 |  | (12) |
Gross Unrealized Losses 12 Continuous Months or Longer | (40) |  | (80) |
Estimated fair value | 1,925 | [1] | 2,878 | [2]
Short-term investments | Corporate debt securities |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 99,517 |  | 95,899 |
Gross Unrealized Gains | 96 |  | 7 |
Gross Unrealized Losses Less Than 12 Continuous Months | (204) |  | (747) |
Gross Unrealized Losses 12 Continuous Months or Longer | (669) |  | (1,135) |
Estimated fair value | 98,740 | [1] | 94,024 | [2]
Short-term investments | Asset-backed securities |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 29,502 |  | 25,826 |
Gross Unrealized Gains | 14 |  | 0 |
Gross Unrealized Losses Less Than 12 Continuous Months | (60) |  | (149) |
Gross Unrealized Losses 12 Continuous Months or Longer | (143) |  | (269) |
Estimated fair value | $ 29,313 | [1] | $ 25,408 | [2]
[1] | See Note 8. Fair Value Measurements for further discussion on fair values.
[2] | See Note 8. Fair Value Measurements for further discussion on fair values.

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