Financial Assets and Liabilities - Short-term investments (Details) - USD ($) $ in Thousands	Apr. 30, 2023		Oct. 31, 2022
Cash Equivalents and Short-term Investments [Line Items]
Total	$ 151,906		$ 150,511
Gross Unrealized Gains	115		7
Gross Unrealized Losses Less Than 12 Continuous Months	(323)		(1,082)
Gross Unrealized Losses 12 Continuous Months or Longer	(852)		(1,523)
Estimated fair value	150,846	[1]	147,913	[2]
Cash equivalents
Cash Equivalents and Short-term Investments [Line Items]
Total	73,611		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	73,611	[1]	77,683	[2]
Cash equivalents | Money market funds
Cash Equivalents and Short-term Investments [Line Items]
Total	73,611		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	73,611	[1]	77,683	[2]
Short-term investments | U.S. government agency & T-bills
Cash Equivalents and Short-term Investments [Line Items]
Total	20,922		25,816
Gross Unrealized Gains	5		0
Gross Unrealized Losses Less Than 12 Continuous Months	(59)		(174)
Gross Unrealized Losses 12 Continuous Months or Longer	0		(39)
Estimated fair value	20,868	[1]	25,603	[2]
Short-term investments | Municipal bonds
Cash Equivalents and Short-term Investments [Line Items]
Total	1,965		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	(40)		(80)
Estimated fair value	1,925	[1]	2,878	[2]
Short-term investments | Corporate debt securities
Cash Equivalents and Short-term Investments [Line Items]
Total	99,517		95,899
Gross Unrealized Gains	96		7
Gross Unrealized Losses Less Than 12 Continuous Months	(204)		(747)
Gross Unrealized Losses 12 Continuous Months or Longer	(669)		(1,135)
Estimated fair value	98,740	[1]	94,024	[2]
Short-term investments | Asset-backed securities
Cash Equivalents and Short-term Investments [Line Items]
Total	29,502		25,826
Gross Unrealized Gains	14		0
Gross Unrealized Losses Less Than 12 Continuous Months	(60)		(149)
Gross Unrealized Losses 12 Continuous Months or Longer	(143)		(269)
Estimated fair value	$ 29,313	[1]	$ 25,408	[2]

[1] See Note 8. Fair Value Measurements for further discussion on fair values.

[2] See Note 8. Fair Value Measurements for further discussion on fair values.