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Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Revenue Recognition (Details) - USD ($) $ in Millions	Jul. 31, 2026	Jul. 31, 2025	Jul. 31, 2026	Jul. 31, 2025	Jan. 31, 2026
Capitalized Contract Cost [Line Items]
Capitalized costs to obtain customer contracts	$ 183.0		$ 183.0		$ 173.0
Amortization of costs to obtain customer contracts	20.6	$ 13.0	38.6	$ 25.0
Revenue recognized previously included in deferred revenue balance			261.4
Contract assets	14.0		14.0		10.6
Remaining performance obligations	1,026.8		1,026.8		986.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-02-01
Capitalized Contract Cost [Line Items]
Remaining performance obligations					$ 618.8
Timing of satisfaction of performance obligation					12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-08-01
Capitalized Contract Cost [Line Items]
Remaining performance obligations	$ 614.1		$ 614.1
Timing of satisfaction of performance obligation	12 months		12 months
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent
Capitalized Contract Cost [Line Items]
Capitalized costs to obtain customer contracts	$ 114.8		$ 114.8		$ 109.9
Balance Sheet Location [Axis]: us-gaap:PrepaidExpenseAndOtherAssetsCurrent
Capitalized Contract Cost [Line Items]
Capitalized costs to obtain customer contracts	$ 68.2		$ 68.2		$ 63.1