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Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions	Jul. 31, 2019	Apr. 30, 2019	Jul. 31, 2018	Apr. 30, 2018
POM
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 176.0
Current deferred revenue	$ 110.7
Expected recognition period	60 months
TIS
Disaggregation of Revenue [Line Items]
Current deferred revenue	$ 25.4	$ 29.7	$ 31.9	$ 36.4
Expected recognition period	9 months