Revenue Recognition - Remaining Performance Obligation (Details) $ in Millions	Apr. 30, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Remaining performance obligation	$ 1,100.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-05-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation percentage	72.00%
Revenue remaining performance obligation, expected timing of satisfaction period	12 months
Billed consideration
Disaggregation of Revenue [Line Items]
Remaining performance obligation	$ 551.8
Unbilled consideration
Disaggregation of Revenue [Line Items]
Remaining performance obligation	$ 516.1