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SHORT-TERM AND LONG-TERM INVESTMENTS - Components of Investments (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Oct. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 242,853
Estimated Fair Value	242,898
U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	242,853	$ 232,811
Gross Unrealized Gains	51	109
Gross Unrealized Losses	(6)	(27)
Estimated Fair Value	242,898	232,893
Included in short-term investments | U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	181,966	150,559
Gross Unrealized Gains	44	109
Gross Unrealized Losses	0	(1)
Estimated Fair Value	182,010	150,667
Included in long-term investments | U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	60,887	82,252
Gross Unrealized Gains	7	0
Gross Unrealized Losses	(6)	(26)
Estimated Fair Value	$ 60,888	$ 82,226

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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