Deferred Revenue and Perfomance Obligations - Performance Obligation Duration (Details) - Subscription services - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-05-01	Apr. 30, 2020
Revenue From Contracts With Customers [Line Items]
Revenue, remaining performance obligation, percentage	79.00%
Revenue, remaining performance obligation, recognition period	12 months