Financial Instruments - Schedule of Cost and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Jul. 31, 2025	Jan. 31, 2025
Cash equivalents:
Amortized Cost	$ 2,003.0	$ 1,599.0
Long-term
Total, amortized cost	1,901.0	1,424.0
Total, Gross unrealized gains	19.0	13.0
Total, Gross unrealized losses	0.0	(1.0)
Total, fair value	1,920.0	1,436.0
Corporate debt securities
Short-term
Amortized Cost	53.0	79.0
Fair Value	53.0	79.0
Long-term
Amortized Cost	113.0	96.0
Gross Unrealized Gains	1.0	1.0
Gross Unrealized Losses	0.0	0.0
Fair Value	114.0	97.0
U.S. government securities
Cash equivalents:
Fair Value	50.0
Short-term
Amortized Cost	71.0	74.0
Fair Value	71.0	74.0
Long-term
Amortized Cost	60.0	52.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	(1.0)
Fair Value	60.0	51.0
Commercial paper
Short-term
Amortized Cost	55.0	96.0
Fair Value	55.0	96.0
Asset-backed securities
Short-term
Amortized Cost	20.0	19.0
Fair Value	20.0	19.0
Long-term
Amortized Cost	72.0	71.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	72.0	71.0
Certificates of deposit
Short-term
Amortized Cost	18.0
Fair Value	18.0
Agency mortgage-backed securities
Short-term
Amortized Cost	11.0
Fair Value	11.0
Long-term
Amortized Cost	29.0	40.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	29.0	40.0
Other
Short-term
Amortized Cost	5.0	19.0
Fair Value	5.0	19.0
Long-term
Amortized Cost	7.0	8.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	7.0	8.0
Mutual funds
Long-term
Other investments	112.0	106.0
Other investments, gross unrealized gains	18.0	12.0
Other investments, gross unrealized losses	0.0	0.0
Other investments, fair value	130.0	118.0
Money market funds
Cash equivalents:
Amortized Cost	1,095.0	618.0
Fair Value	1,095.0	618.0
Commercial paper
Cash equivalents:
Amortized Cost	85.0	85.0
Fair Value	85.0	85.0
Certificates of deposit
Cash equivalents:
Amortized Cost	44.0	38.0
Fair Value	44.0	38.0
U.S. government securities
Cash equivalents:
Amortized Cost	50.0	19.0
Fair Value	50.0	19.0
Other
Cash equivalents:
Amortized Cost	1.0	4.0
Fair Value	$ 1.0	$ 4.0

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