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Investments - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2026	Apr. 30, 2025	Jan. 31, 2026
Equity Securities without Readily Determinable Fair Value [Line Items]
Unrealized losses for securities in unrealized loss position for less than 12 months	$ 15,400		$ 1,500
Available-for-sale realized gains (losses)	0	$ 0
Purchase of strategic investments in equity securities	145,695	$ 0
Equity Securities Without Readily Determinable Fair Value, Anthropic
Equity Securities without Readily Determinable Fair Value [Line Items]
Purchase of strategic investments in equity securities	46,000
Strategic investments	1,266,900
Equity Securities Without Readily Determinable Fair Value, Other Private AI Companies
Equity Securities without Readily Determinable Fair Value [Line Items]
Purchase of strategic investments in equity securities	99,700
Equity Securities Without Readily Determinable Fair Value, Other than Anthropic
Equity Securities without Readily Determinable Fair Value [Line Items]
Net unrealized gains on strategic investments	$ 154,500