Financial Assets and Liabilities - Short-term investments (Details) - USD ($) $ in Thousands	Jan. 31, 2022		Oct. 31, 2021
Cash Equivalents [Line Items]
Total	$ 148,494		$ 148,195
Gross Unrealized Gains	7		13
Gross Unrealized Losses Less Than 12 Continuous Months	(753)		(259)
Gross Unrealized Losses 12 Continuous Months or Longer	0		0
Estimated fair value	147,748	[1]	147,949
Cash equivalents
Cash Equivalents [Line Items]
Total	75,680		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	75,680	[1]	172,934	[2]
Cash equivalents | Money market funds
Cash Equivalents [Line Items]
Total	75,680		172,934
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	75,680	[1]	172,934	[2]
Short-term investments | Corporate debt securities
Cash Equivalents [Line Items]
Total	103,946		103,615
Gross Unrealized Gains	5		7
Gross Unrealized Losses Less Than 12 Continuous Months	(537)		(170)
Gross Unrealized Losses 12 Continuous Months or Longer
Estimated fair value	103,414	[1]	103,452
Short-term investments | U.S. government agency & T-bills
Cash Equivalents [Line Items]
Total	8,095		6,447
Gross Unrealized Gains			0
Gross Unrealized Losses Less Than 12 Continuous Months	(31)		(5)
Gross Unrealized Losses 12 Continuous Months or Longer
Estimated fair value	8,064	[1]	6,442
Short-term investments | Municipal bonds
Cash Equivalents [Line Items]
Total	3,946		4,588
Gross Unrealized Gains			0
Gross Unrealized Losses Less Than 12 Continuous Months	(34)		(12)
Gross Unrealized Losses 12 Continuous Months or Longer
Estimated fair value	3,912	[1]	4,576
Short-term investments | Asset-backed securities
Cash Equivalents [Line Items]
Total	32,507		33,545
Gross Unrealized Gains	2		6
Gross Unrealized Losses Less Than 12 Continuous Months	(151)		(72)
Gross Unrealized Losses 12 Continuous Months or Longer
Estimated fair value	$ 32,358	[1]	$ 33,479

[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.