Commitments And Contingencies (Details) - USD ($)	6 Months Ended
	Oct. 31, 2018	Apr. 30, 2018	Oct. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
POM Maximum per Tax Return	$ 10,000
Standard guarantee accrual amount	7,100,000	$ 9,400,000	$ 3,600,000
Contingent business acquisition obligations	11,500,000	12,100,000	10,100,000
Lines of credit, total obligation	32,200,000
Remaining franchise equity lines of credit-undrawn commitment	12,700,000
Loss Contingencies [Line Items]
Loss contingency accrual	3,000,000	2,700,000	2,500,000
SCC
Loss Contingencies [Line Items]
Loss contingency accrual	$ 0	$ 0	$ 4,500,000