Short-Term and Long-Term Investments - Components of Investments (Details) - USD ($) $ in Thousands	May 01, 2021	Oct. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 243,459
Estimated Fair Value	243,531
U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	243,459	$ 232,811
Gross Unrealized Gains	74	109
Gross Unrealized Losses	(2)	(27)
Estimated Fair Value	243,531	232,893
Included in short-term investments | U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	151,764	150,559
Gross Unrealized Gains	52	109
Gross Unrealized Losses	0	(1)
Estimated Fair Value	151,816	150,667
Included in long-term investments | U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	91,695	82,252
Gross Unrealized Gains	22	0
Gross Unrealized Losses	(2)	(26)
Estimated Fair Value	$ 91,715	$ 82,226