Receivables (Schedule Of Loans Receivable) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012	Apr. 30, 2012	Oct. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Short-term	$ 167,272	$ 238,447	$ 176,474
Receivables, net	34,455
Emerald Advance Lines Of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Short-term	23,630	23,717	29,929
Long-term	10,825	13,007	17,749
Receivables, net	34,455	36,724	47,678
Loans To Franchisees [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Short-term	69,110	61,252	67,594
Long-term	119,102	109,837	130,280
Receivables, net	$ 188,212	$ 171,089	$ 197,874