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Financial Assets and Liabilities - Short-term investments (Details) - USD ($) $ in Thousands | Jan. 31, 2022 | Oct. 31, 2021
--- | --- | ---
Cash Equivalents [Line Items] |  |  |  |
Total | $ 148,494 |  | $ 148,195 |
Gross Unrealized Gains | 7 |  | 13 |
Gross Unrealized Losses Less Than 12 Continuous Months | (753) |  | (259) |
Gross Unrealized Losses 12 Continuous Months or Longer | 0 |  | 0 |
Estimated fair value | 147,748 | [1] | 147,949 |
Cash equivalents |  |  |  |
Cash Equivalents [Line Items] |  |  |  |
Total | 75,680 |  | 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 | 75,680 | [1] | 172,934 | [2]
Cash equivalents | Money market funds |  |  |  |
Cash Equivalents [Line Items] |  |  |  |
Total | 75,680 |  | 172,934 |
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 | 75,680 | [1] | 172,934 | [2]
Short-term investments | Corporate debt securities |  |  |  |
Cash Equivalents [Line Items] |  |  |  |
Total | 103,946 |  | 103,615 |
Gross Unrealized Gains | 5 |  | 7 |
Gross Unrealized Losses Less Than 12 Continuous Months | (537) |  | (170) |
Gross Unrealized Losses 12 Continuous Months or Longer |  |  |  |
Estimated fair value | 103,414 | [1] | 103,452 |
Short-term investments | U.S. government agency & T-bills |  |  |  |
Cash Equivalents [Line Items] |  |  |  |
Total | 8,095 |  | 6,447 |
Gross Unrealized Gains |  |  | 0 |
Gross Unrealized Losses Less Than 12 Continuous Months | (31) |  | (5) |
Gross Unrealized Losses 12 Continuous Months or Longer |  |  |  |
Estimated fair value | 8,064 | [1] | 6,442 |
Short-term investments | Municipal bonds |  |  |  |
Cash Equivalents [Line Items] |  |  |  |
Total | 3,946 |  | 4,588 |
Gross Unrealized Gains |  |  | 0 |
Gross Unrealized Losses Less Than 12 Continuous Months | (34) |  | (12) |
Gross Unrealized Losses 12 Continuous Months or Longer |  |  |  |
Estimated fair value | 3,912 | [1] | 4,576 |
Short-term investments | Asset-backed securities |  |  |  |
Cash Equivalents [Line Items] |  |  |  |
Total | 32,507 |  | 33,545 |
Gross Unrealized Gains | 2 |  | 6 |
Gross Unrealized Losses Less Than 12 Continuous Months | (151) |  | (72) |
Gross Unrealized Losses 12 Continuous Months or Longer |  |  |  |
Estimated fair value | $ 32,358 | [1] | $ 33,479 |
[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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