Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Apr. 30, 2017
Commitments And Contingencies [Line Items]
Standard guarantee accrual amount	$ 4,500	$ 5,800	$ 6,800
Contingent business acquisition obligations	9,125		$ 10,428
Lines of credit, total obligation	45,200
Remaining franchise equity lines of credit-undrawn commitment	20,300
Loss Contingency Accrual [Roll Forward]
Balance, beginning of the period	2,300
Balance, end of the period	1,700	2,300
Scc [Member]
Loss Contingency Accrual [Roll Forward]
Balance, beginning of the period	4,500	65,265
Loss provisions	0	235
Payments	0	(40,000)
Balance, end of the period	$ 4,500	25,500
Level 3
Commitments And Contingencies [Line Items]
Contingent business acquisition obligations		$ 8,347