Financial Assets and Liabilities - Short-term investments (Details) - USD ($) $ in Thousands	Jul. 31, 2023	Oct. 31, 2022
Cash Equivalents and Short-term Investments [Line Items]
Total	$ 149,715	$ 150,511
Gross Unrealized Gains	54	7
Gross Unrealized Losses Less Than 12 Continuous Months	(653)	(1,082)
Gross Unrealized Losses 12 Continuous Months or Longer	(673)	(1,523)
Estimated fair value	148,443	147,913
Cash equivalents
Cash Equivalents and Short-term Investments [Line Items]
Total	202,572	77,683
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	202,572	77,683
Cash equivalents | Money market funds
Cash Equivalents and Short-term Investments [Line Items]
Total	200,288	77,683
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	200,288	77,683
Cash equivalents | U.S. government agency securities
Cash Equivalents and Short-term Investments [Line Items]
Total	2,284
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	2,284
Short-term investments | U.S. government agency & T-bills
Cash Equivalents and Short-term Investments [Line Items]
Total	20,595	25,816
Gross Unrealized Gains	0	0
Gross Unrealized Losses Less Than 12 Continuous Months	(82)	(174)
Gross Unrealized Losses 12 Continuous Months or Longer	(6)	(39)
Estimated fair value	20,507	25,603
Short-term investments | Municipal bonds
Cash Equivalents and Short-term Investments [Line Items]
Total	1,535	2,970
Gross Unrealized Gains	0	0
Gross Unrealized Losses Less Than 12 Continuous Months	0	(12)
Gross Unrealized Losses 12 Continuous Months or Longer	(22)	(80)
Estimated fair value	1,513	2,878
Short-term investments | Corporate debt securities
Cash Equivalents and Short-term Investments [Line Items]
Total	96,614	95,899
Gross Unrealized Gains	42	7
Gross Unrealized Losses Less Than 12 Continuous Months	(462)	(747)
Gross Unrealized Losses 12 Continuous Months or Longer	(529)	(1,135)
Estimated fair value	95,665	94,024
Short-term investments | Asset-backed securities
Cash Equivalents and Short-term Investments [Line Items]
Total	30,971	25,826
Gross Unrealized Gains	12	0
Gross Unrealized Losses Less Than 12 Continuous Months	(109)	(149)
Gross Unrealized Losses 12 Continuous Months or Longer	(116)	(269)
Estimated fair value	$ 30,758	$ 25,408