Commitments and Contingencies (Details) - USD ($)	3 Months Ended
	Jul. 31, 2019	Apr. 30, 2019	Jul. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
POM Maximum per Tax Return	$ 10,000
Standard guarantee accrual amount	8,800,000	$ 9,900,000	$ 8,600,000
Contingent business acquisition obligations	9,600,000	11,100,000	10,600,000
Lines of credit, total obligation	6,000,000.0
Remaining franchise equity lines of credit-undrawn commitment	4,200,000
Loss Contingencies [Line Items]
Loss contingency accrual	1,600,000	1,900,000	2,800,000
SCC
Loss Contingencies [Line Items]
Loss contingency accrual	$ 0	$ 0	$ 0