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Investments - Additional Information (Details) - USD ($)	3 Months Ended			9 Months Ended
	Oct. 31, 2023	Jul. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022	Jan. 31, 2023
Net Investment Income [Line Items]
Unrealized losses for securities in unrealized loss position for less than 12 months	$ 22,100,000			$ 22,100,000		$ 24,800,000
Unrealized losses for securities in unrealized loss position for 12 months or longer	13,900,000			13,900,000		$ 42,000,000
Available-for-sale, realized gain (loss)	$ 0		$ 0	0	$ 0
Purchase of strategic investments				52,800,000	65,050,000
Proceeds from strategic investments				107,244,000	$ 300,000
Investment in Equity Securities of Private Companies
Net Investment Income [Line Items]
Purchase of strategic investments				$ 52,800,000
Investment in Equity Securities of Public Companies
Net Investment Income [Line Items]
Proceeds from strategic investments		$ 107,200,000