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Financial Assets and Liabilities - Short-term investments (Details) - USD ($) $ in Thousands | Jan. 31, 2023 | Oct. 31, 2022
--- | --- | ---
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | $ 148,490 |  | $ 150,511 |
Gross Unrealized Gains | 127 |  | 7 |
Gross Unrealized Losses Less Than 12 Continuous Months | (476) |  | (1,082) |
Gross Unrealized Losses 12 Continuous Months or Longer | (1,091) |  | (1,523) |
Estimated fair value | 147,050 | [1] | 147,913 | [2]
Cash equivalents |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 45,367 |  | 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 | 45,367 | [1] | 77,683 | [2]
Cash equivalents | Money market funds |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 45,367 |  | 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 | 45,367 | [1] | 77,683 | [2]
Short-term investments | U.S. government agency & T-bills |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 24,851 |  | 25,816 |
Gross Unrealized Gains | 5 |  | 0 |
Gross Unrealized Losses Less Than 12 Continuous Months | (108) |  | (174) |
Gross Unrealized Losses 12 Continuous Months or Longer | 0 |  | (39) |
Estimated fair value | 24,748 | [1] | 25,603 | [2]
Short-term investments | Municipal bonds |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 2,695 |  | 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 | (56) |  | (80) |
Estimated fair value | 2,639 | [1] | 2,878 | [2]
Short-term investments | Corporate debt securities |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 93,437 |  | 95,899 |
Gross Unrealized Gains | 103 |  | 7 |
Gross Unrealized Losses Less Than 12 Continuous Months | (304) |  | (747) |
Gross Unrealized Losses 12 Continuous Months or Longer | (852) |  | (1,135) |
Estimated fair value | 92,384 | [1] | 94,024 | [2]
Short-term investments | Asset-backed securities |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 27,507 |  | 25,826 |
Gross Unrealized Gains | 19 |  | 0 |
Gross Unrealized Losses Less Than 12 Continuous Months | (64) |  | (149) |
Gross Unrealized Losses 12 Continuous Months or Longer | (183) |  | (269) |
Estimated fair value | $ 27,279 | [1] | $ 25,408 | [2]
[1] | See Note 7. Fair Value Measurements for further discussion on fair values.
[2] | See Note 7. Fair Value Measurements for further discussion on fair values.

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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