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Financial Assets and Liabilities - Short-term investments (Details) - USD ($) $ in Thousands | Apr. 30, 2024 | Oct. 31, 2023
--- | --- | ---
Cash Equivalents and Short-term Investments [Line Items] |  |
Total | $ 156,987 | $ 152,725
Gross Unrealized Gains | 140 | 34
Gross Unrealized Losses Less Than 12 Continuous Months | (213) | (609)
Gross Unrealized Losses 12 Continuous Months or Longer | (134) | (511)
Estimated fair value | 156,780 | 151,639
Cash equivalents |  |
Cash Equivalents and Short-term Investments [Line Items] |  |
Total | 46,938 | 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 | 46,938 | 13,123
Cash equivalents | Money market funds |  |
Cash Equivalents and Short-term Investments [Line Items] |  |
Total | 46,938 | 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 | 46,938 | 10,129
Cash equivalents | U.S. Treasury, agency & T-bills |  |
Cash Equivalents and Short-term Investments [Line Items] |  |
Total |  | 2,994
Gross Unrealized Gains |  | 0
Gross Unrealized Losses Less Than 12 Continuous Months |  | 0
Gross Unrealized Losses 12 Continuous Months or Longer |  | 0
Estimated fair value |  | 2,994
Short-term Investments | U.S. Treasury, agency & T-bills |  |
Cash Equivalents and Short-term Investments [Line Items] |  |
Total | 18,739 | 15,752
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses Less Than 12 Continuous Months | (38) | (61)
Gross Unrealized Losses 12 Continuous Months or Longer | (3) | (2)
Estimated fair value | 18,698 | 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 | (4) | (16)
Estimated fair value | 511 | 499
Short-term Investments | Corporate debt securities |  |
Cash Equivalents and Short-term Investments [Line Items] |  |
Total | 104,522 | 103,213
Gross Unrealized Gains | 101 | 13
Gross Unrealized Losses Less Than 12 Continuous Months | (154) | (455)
Gross Unrealized Losses 12 Continuous Months or Longer | (84) | (396)
Estimated fair value | 104,385 | 102,375
Short-term Investments | Asset-backed securities |  |
Cash Equivalents and Short-term Investments [Line Items] |  |
Total | 33,211 | 33,245
Gross Unrealized Gains | 39 | 21
Gross Unrealized Losses Less Than 12 Continuous Months | (21) | (93)
Gross Unrealized Losses 12 Continuous Months or Longer | (43) | (97)
Estimated fair value | $ 33,186 | $ 33,076

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