Revenue - Additional Information (Details) - USD ($)	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Jan. 31, 2020
Revenues [Abstract]
Deferred revenue	$ 193,000,000.0		$ 190,800,000
Percent of revenue recognized from deferred revenue	52.00%	50.00%
Remaining performance obligation	$ 209,700,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unbilled receivables	5,900,000
Deferred commissions	80,000,000.0
Amortization of deferred commissions	6,500,000	$ 4,400,000
Impairment loss	$ 0	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-11-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percentage	54.00%
Expected timing of satisfaction of remaining performance obligation	12 months