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Receivables (Schedule Of Loans Receivable) (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2012
Apr. 30, 2012
Jul. 31, 2011
Emerald Advance Lines Of Credit [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Short-term $ 24,215 $ 23,717 $ 30,699
Long-term 11,689 13,007 18,539
Receivables, net 35,904 36,724 49,238
Loans To Franchisees [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Short-term 60,459 61,252 62,313
Long-term 112,810 109,837 123,962
Receivables, net $ 173,269 $ 171,089 $ 186,275