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Financial Assets and Liabilities - Short-term investments (Details) - Cash equivalents - USD ($) $ in Thousands | Apr. 30, 2020 | Oct. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale securities, cost | $ 168,653 |  | $ 166,024 |
Gross unrealized gains | 0 |  | 0 |
Gross unrealized losses less than 12 months | 0 |  | 0 |
Gross unrealized losses 12 months or longer | 0 |  | 0 |
Estimated fair value | 168,653 | [1] | 166,024 | [2]
Money market funds |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale securities, cost | 168,653 |  | 166,024 |
Gross unrealized gains | 0 |  | 0 |
Gross unrealized losses less than 12 months | 0 |  | 0 |
Gross unrealized losses 12 months or longer | 0 |  | 0 |
Estimated fair value | $ 168,653 | [1] | $ 166,024 | [2]
[1] | See Note 7. Fair Value Measures for further discussion on fair values of cash equivalents.
[2] | See Note 7. Fair Value Measures for further discussion on fair values of cash equivalents.

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as 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 http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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