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Financial Assets and Liabilities - Short-term investments (Details) - Cash equivalents - USD ($) $ in Thousands | Apr. 30, 2021 | Oct. 31, 2020
--- | --- | ---
Cash Equivalents [Line Items] |  |  |
Cost |  | $ 234,243 | $ 304,127
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 | [1] | 234,243 | 304,127
Money market funds |  |  |
Cash Equivalents [Line Items] |  |  |
Cost |  | 234,243 | 304,127
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 | [1] | $ 234,243 | $ 304,127
[1] | See Note 7. Fair Value Measures for further discussion on fair values of cash equivalents.

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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=121645371&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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- 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 less than twelve months. + References No definition available. + Details
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