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Investments - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024	Jan. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unrealized losses for securities in unrealized loss position for less than 12 months	$ 1.2		$ 1.2		$ 6.2
Available-for-sale realized gains (losses)	0.0	$ 0.0	0.0	$ 0.0
Equity Securities Without Readily Determinable Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains on strategic investments	$ 388.0		$ 395.0