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Investments - Narrative (Details) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 28, 2021	Jun. 30, 2021	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020	Jan. 31, 2021
Schedule of Equity Method Investments [Line Items]
Proceeds of sale of debt securities			$ 0	$ 0	$ 10,000,000	$ 5,000,000
Payments to acquire equity method investments							$ 50,000,000
Equity method investment, ownership percentage							6.00%
Impairment loss			0	0	0	0
Proceeds from sale of available-for-sale securities, equity		$ 5,000,000	0	0	17,000,000	0
Net realized gains (losses) recognized on equity investments sold		$ 3,000,000	11,759,000	0	4,236,000	1,591,000
Upward price adjustment to non-marketable equity investments			20,000,000	0	34,000,000	0
Downward price adjustment to non-marketable equity investments				0		0
Impairment loss on non-marketable equity securities			0	$ 0	2,000,000	$ 3,000,000
Equity securities, FV-NI, cost, sold					7,000,000
Included in Marketable securities
Schedule of Equity Method Investments [Line Items]
Equity securities, unrealized loss			7,000,000
Equity securities, unrealized gain					91,000,000
Zimit, Inc.
Schedule of Equity Method Investments [Line Items]
Gain on sale of equity securities marketable equity investments	$ 12,000,000
Included in Marketable securities
Schedule of Equity Method Investments [Line Items]
Equity securities			$ 134,462,000		$ 134,462,000		$ 21,300,000

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