Commitments And Contingencies (Narrative) (Details) - USD ($)	12 Months Ended			96 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2016
Commitments And Contingencies [Line Items]
Additional tax assessment limit per client	$ 6,000			$ 6,000
Standard guarantee accrual amount	$ 7,000,000	$ 8,400,000		7,000,000
Document Fiscal Year Focus	2016
Contingent acquisition liabilities, Carrying Amount	$ 8,657,000	10,667,000		8,657,000
Lines of credit, total obligation	69,400,000			69,400,000
Remaining franchise equity lines of credit-undrawn commitment	34,300,000			34,300,000
Amounts deferred for new extended service plans issued		113,849,000
Revenue recognized on previous deferrals		(90,329,000)
Deferred revenue		189,779,000	$ 166,259,000
Obligation under deferred compensation plans	29,000,000	33,800,000		29,000,000
Rent expense	$ 228,500,000	213,100,000	$ 203,300,000
Claims received for loans				2,600,000,000
Minimum
Commitments And Contingencies [Line Items]
Term of operating leases, years	3 years
Maximum
Commitments And Contingencies [Line Items]
Term of operating leases, years	5 years
Peace of Mind
Commitments And Contingencies [Line Items]
Amounts deferred for new extended service plans issued	$ 119,915,000
Revenue recognized on previous deferrals	(105,352,000)
Deferred revenue	204,342,000	$ 189,779,000		204,342,000
Emerald Advance lines of credit
Commitments And Contingencies [Line Items]
Commitments to Extend Credit, Total	$ 13,400,000			$ 13,400,000