Financial Assets and Liabilities - Short-term investments (Details) - USD ($) $ in Thousands	Jul. 31, 2022		Oct. 31, 2021
Cash Equivalents and Short-term Investments [Line Items]
Total	$ 149,519		$ 148,195
Gross Unrealized Gains	37		13
Gross Unrealized Losses Less Than 12 Continuous Months	(1,813)		(259)
Gross Unrealized Losses 12 Continuous Months or Longer	(144)		0
Estimated fair value	147,599	[1]	147,949	[2]
Cash equivalents
Cash Equivalents and Short-term Investments [Line Items]
Total	94,796		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	94,796	[1]	172,934	[2]
Cash equivalents | Money market funds
Cash Equivalents and Short-term Investments [Line Items]
Total	94,796		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	94,796	[1]	172,934	[2]
Short-term investments | Corporate debt securities
Cash Equivalents and Short-term Investments [Line Items]
Total	98,318		103,615
Gross Unrealized Gains	30		7
Gross Unrealized Losses Less Than 12 Continuous Months	(1,289)		(170)
Gross Unrealized Losses 12 Continuous Months or Longer	(108)		0
Estimated fair value	96,951	[1]	103,452	[2]
Short-term investments | U.S. government agency & T-bills
Cash Equivalents and Short-term Investments [Line Items]
Total	19,917		6,447
Gross Unrealized Gains	6		0
Gross Unrealized Losses Less Than 12 Continuous Months	(117)		(5)
Gross Unrealized Losses 12 Continuous Months or Longer	0		0
Estimated fair value	19,806	[1]	6,442	[2]
Short-term investments | Municipal bonds
Cash Equivalents and Short-term Investments [Line Items]
Total	3,105		4,588
Gross Unrealized Gains	0		0
Gross Unrealized Losses Less Than 12 Continuous Months	(79)		(12)
Gross Unrealized Losses 12 Continuous Months or Longer	0		0
Estimated fair value	3,026	[1]	4,576	[2]
Short-term investments | Asset-backed securities
Cash Equivalents and Short-term Investments [Line Items]
Total	28,179		33,545
Gross Unrealized Gains	1		6
Gross Unrealized Losses Less Than 12 Continuous Months	(328)		(72)
Gross Unrealized Losses 12 Continuous Months or Longer	(36)		0
Estimated fair value	$ 27,816	[1]	$ 33,479	[2]

[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.