Deferred Revenue and Remaining Performance Obligations - Remaining Performance Obligations (Details) $ in Millions	12 Months Ended
	Jan. 31, 2021 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1,300.0
Contracts With Original Terms Exceeding One Year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 865.6
Weighted average term	2 years 6 months