Commitments and Contingencies (Details) - USD ($)	6 Months Ended
	Oct. 31, 2019	Apr. 30, 2019	Oct. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
POM Maximum per Tax Return	$ 10,000
Standard guarantee accrual amount	7,600,000	$ 9,900,000	$ 7,100,000
Contingent business acquisition obligations	4,100,000	11,100,000	11,500,000
Lines of credit, total obligation	34,200,000
Remaining franchise equity lines of credit-undrawn commitment	22,100,000
Loss Contingencies [Line Items]
Loss contingency accrual	1,600,000	1,900,000	3,000,000.0
SCC
Loss Contingencies [Line Items]
Loss contingency accrual	$ 0	$ 0	$ 0