Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended			84 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2015
Commitments And Contingencies [Line Items]
Additional tax assessment limit per client	$ 5,500			$ 5,500
Standard guarantee accrual amount	8,400,000	11,400,000		8,400,000
Document Fiscal Year Focus	2015
Contingent acquisition liabilities, Carrying Amount	10,667,000	9,206,000		10,667,000
Lines of credit, total obligation	78,900,000			78,900,000
Remaining franchise equity lines of credit-undrawn commitment	38,400,000			38,400,000
Amounts deferred for new extended service plans issued		88,636,000
Revenue recognized on previous deferrals		(89,685,000)
Deferred revenue		145,237,000	146,286,000
Obligation under deferred compensation plans	33,800,000	38,100,000		33,800,000
Compensating balances	225,100,000			225,100,000
Rent expense	213,100,000	203,300,000	201,000,000
Claims received for loans				2,400,000,000
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 Company-Owned
Commitments And Contingencies [Line Items]
Amounts deferred for new extended service plans issued	94,483,000
Revenue recognized on previous deferrals	(81,551,000)
Deferred revenue	158,169,000	145,237,000		158,169,000
Peace of Mind Franchise
Commitments And Contingencies [Line Items]
Amounts deferred for new extended service plans issued	19,400,000
Revenue recognized on previous deferrals	(8,800,000)
Deferred revenue	$ 31,600,000			$ 31,600,000