Revenue - Costs to Obtain or Fulfill a Contract (Details) - USD ($)	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Disaggregation of Revenue [Line Items]
Costs to obtain and fulfill a contract, expense	$ 5,100,000	$ 1,200,000	$ 1,000,000
Costs to obtain and fulfill a contract, impairment loss	0	0	$ 0
Prepaid Expenses and Other Current Assets
Disaggregation of Revenue [Line Items]
Costs to obtain and fulfill a contract	5,700,000	3,200,000
Other Assets
Disaggregation of Revenue [Line Items]
Costs to obtain and fulfill a contract	$ 18,200,000	$ 9,100,000