Accounts And Notes Receivable (Details) (USD $)	Aug. 31, 2014	May 31, 2014	Aug. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Royalties and other trade receivables		$ 18,340,000	$ 16,506,000
Current accounts and notes receivable, gross		39,738,000	30,689,000
Allowance for doubtful accounts and notes receivable, current		(1,130,000)	(1,547,000)
Accounts and notes receivable, net		38,608,000	29,142,000
Receivables from franchisees		4,386,000	5,003,000
Receivables from advertising funds		3,840,000	5,810,000
Allowance for doubtful notes receivable		(745,000)	(800,000)
Notes receivable, net		7,481,000	10,013,000
Notes Receivable From Franchisees [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current accounts and notes receivable, gross		1,038,000	4,003,000
Receivables From Advertising Funds [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current accounts and notes receivable, gross		12,596,000	5,203,000
Current receivables from advertising funds to be repaid	6,000,000
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current accounts and notes receivable, gross		$ 7,764,000	$ 4,977,000