Deferred Revenue and Remaining Performance Obligations - Remaining Performance Obligations (Details) $ in Millions	9 Months Ended
	Oct. 31, 2020 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 927.9
Contracts With Original Terms Exceeding One Year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 560.1
Weighted-average remaining life	2.5 years