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Financial Assets and Liabilities - Short-term investments (Details) - USD ($) $ in Thousands | Jul. 31, 2022 | Oct. 31, 2021
--- | --- | ---
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | $ 149,519 |  | $ 148,195 |
Gross Unrealized Gains | 37 |  | 13 |
Gross Unrealized Losses Less Than 12 Continuous Months | (1,813) |  | (259) |
Gross Unrealized Losses 12 Continuous Months or Longer | (144) |  | 0 |
Estimated fair value | 147,599 | [1] | 147,949 | [2]
Cash equivalents |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 94,796 |  | 172,934 |
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 | 94,796 | [1] | 172,934 | [2]
Cash equivalents | Money market funds |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 94,796 |  | 172,934 |
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 | 94,796 | [1] | 172,934 | [2]
Short-term investments | Corporate debt securities |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 98,318 |  | 103,615 |
Gross Unrealized Gains | 30 |  | 7 |
Gross Unrealized Losses Less Than 12 Continuous Months | (1,289) |  | (170) |
Gross Unrealized Losses 12 Continuous Months or Longer | (108) |  | 0 |
Estimated fair value | 96,951 | [1] | 103,452 | [2]
Short-term investments | U.S. government agency & T-bills |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 19,917 |  | 6,447 |
Gross Unrealized Gains | 6 |  | 0 |
Gross Unrealized Losses Less Than 12 Continuous Months | (117) |  | (5) |
Gross Unrealized Losses 12 Continuous Months or Longer | 0 |  | 0 |
Estimated fair value | 19,806 | [1] | 6,442 | [2]
Short-term investments | Municipal bonds |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 3,105 |  | 4,588 |
Gross Unrealized Gains | 0 |  | 0 |
Gross Unrealized Losses Less Than 12 Continuous Months | (79) |  | (12) |
Gross Unrealized Losses 12 Continuous Months or Longer | 0 |  | 0 |
Estimated fair value | 3,026 | [1] | 4,576 | [2]
Short-term investments | Asset-backed securities |  |  |  |
Cash Equivalents and Short-term Investments [Line Items] |  |  |  |
Total | 28,179 |  | 33,545 |
Gross Unrealized Gains | 1 |  | 6 |
Gross Unrealized Losses Less Than 12 Continuous Months | (328) |  | (72) |
Gross Unrealized Losses 12 Continuous Months or Longer | (36) |  | 0 |
Estimated fair value | $ 27,816 | [1] | $ 33,479 | [2]
[1] | See Note 8. Fair Value Measurements for further discussion on fair values of cash equivalents and short-term investments.
[2] | See Note 8. Fair Value Measurements for further discussion on fair values of cash equivalents and short-term investments.

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