Revenue - Costs to Obtain or Fulfill a Contract (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Disaggregation of Revenue [Line Items]
Costs to obtain and fulfill a contract, expense	$ 5.9	$ 5.1	$ 1.2
Costs to obtain and fulfill a contract, impairment loss	0.0	0.0	$ 0.0
Prepaid Expenses and Other Current Assets
Disaggregation of Revenue [Line Items]
Costs to obtain and fulfill a contract	6.2	5.7
Other Assets
Disaggregation of Revenue [Line Items]
Costs to obtain and fulfill a contract	$ 14.5	$ 18.2