Investments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Investment Holdings [Line Items]
Interest income from marketable securities			$ 647.0	$ 527.0	$ 199.0
Strategic investments	$ 4,852.0	$ 4,848.0	4,852.0	4,848.0
Privately held equity securities
Investment Holdings [Line Items]
Upward adjustments	385.0	125.0
Downward adjustments	583.0	465.0
Variable Interest Entity, Not Primary Beneficiary
Investment Holdings [Line Items]
Strategic investments	$ 484.0	$ 382.0	$ 484.0	$ 382.0