Deferred Revenue and Remaining Performance Obligations - Remaining Performance Obligations (Details) $ in Billions	9 Months Ended
	Oct. 31, 2021 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1.8
Contracts With Original Terms Exceeding One Year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percentage	75.00%
Weighted-average remaining life	2 years 4 months 24 days