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Financial Assets and Liabilities - Short-term investments (Details) - USD ($) $ in Thousands | Jan. 31, 2024 | Oct. 31, 2023
--- | --- | ---
Cash Equivalents and Short-term Investments [Line Items] |  |
Total | $ 154,564 | $ 152,725
Gross Unrealized Gains | 285 | 34
Gross Unrealized Losses Less Than 12 Continuous Months | (122) | (609)
Gross Unrealized Losses 12 Continuous Months or Longer | (237) | (511)
Estimated fair value | 154,490 | 151,639
Cash equivalents |  |
Cash Equivalents and Short-term Investments [Line Items] |  |
Total | 47,637 | 13,123
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 | 47,637 | 13,123
Cash equivalents | Money market funds |  |
Cash Equivalents and Short-term Investments [Line Items] |  |
Total | 44,751 | 10,129
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 | 44,751 | 10,129
Cash equivalents | U.S. Treasury, agency & T-bills |  |
Cash Equivalents and Short-term Investments [Line Items] |  |
Total | 2,886 | 2,994
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 | 2,886 | 2,994
Short-term Investments | U.S. Treasury, agency & T-bills |  |
Cash Equivalents and Short-term Investments [Line Items] |  |
Total | 16,778 | 15,752
Gross Unrealized Gains | 6 | 0
Gross Unrealized Losses Less Than 12 Continuous Months | (29) | (61)
Gross Unrealized Losses 12 Continuous Months or Longer | 0 | (2)
Estimated fair value | 16,755 | 15,689
Short-term Investments | Municipal bonds |  |
Cash Equivalents and Short-term Investments [Line Items] |  |
Total | 515 | 515
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses Less Than 12 Continuous Months | 0 | 0
Gross Unrealized Losses 12 Continuous Months or Longer | (9) | (16)
Estimated fair value | 506 | 499
Short-term Investments | Corporate debt securities |  |
Cash Equivalents and Short-term Investments [Line Items] |  |
Total | 102,108 | 103,213
Gross Unrealized Gains | 208 | 13
Gross Unrealized Losses Less Than 12 Continuous Months | (81) | (455)
Gross Unrealized Losses 12 Continuous Months or Longer | (173) | (396)
Estimated fair value | 102,062 | 102,375
Short-term Investments | Asset-backed securities |  |
Cash Equivalents and Short-term Investments [Line Items] |  |
Total | 35,163 | 33,245
Gross Unrealized Gains | 71 | 21
Gross Unrealized Losses Less Than 12 Continuous Months | (12) | (93)
Gross Unrealized Losses 12 Continuous Months or Longer | (55) | (97)
Estimated fair value | $ 35,167 | $ 33,076

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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