Commitments And Contingencies (Narrative) (Details) (USD $)	Jul. 31, 2013	Apr. 30, 2013	Jul. 31, 2012
Commitments And Contingencies [Line Items]
Standard guarantee accrual amount	$ 15,700,000	$ 18,000,000	$ 15,500,000
Contingent business acquisition obligations	10,766,000	11,277,000
Lines of credit, total obligation	91,500,000
Remaining franchise equity lines of credit-undrawn commitment	45,500,000
Maximum funding by facility	1,500,000,000
Financing Receivables, Line of Credit Facility, Compensating Balances	210,000,000
Royalties from franchisees
Commitments And Contingencies [Line Items]
Financing Receivable, Line of Credit Facility, Total Obligation	27,400,000
Financing Receivable, Line of Credit Facility, Remaining Commitment to Fund	3,500,000
Level 3
Commitments And Contingencies [Line Items]
Contingent business acquisition obligations			$ 7,090,000