Receivables (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jul. 31, 2012	Apr. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired non-accrual status term, days	60 days
Loans made to franchisees	$ 173.3	$ 171.1
Loans past due	1.1
Emerald Advance Lines Of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual status loans	30.3	31.4
Term Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans made to franchisees	129.3	127.0
Revolving Lines Of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans made to franchisees	$ 44.0	$ 44.1