CLOSURES AND IMPAIRMENTS EXPENSE (Details) (USD $)	3 Months Ended		6 Months Ended
	Nov. 29, 2011	Nov. 30, 2010	Nov. 29, 2011	Nov. 30, 2010
Impairment Expense [Abstract]
Property impairments	$ 630,000	$ 12,000	$ 836,000	$ 1,338,000
Closed restaurant lease reserves	(153,000)	327,000	(74,000)	663,000
Other closing costs	226,000	9,000	416,000	83,000
(Gain)/loss on sale of surplus properties	(50,000)	0	(80,000)	3,000
Total Closure and Impairments Expenses	653,000	348,000	1,098,000	2,087,000
Closed Location Lease Obligation [Roll Forward]
Beginning balance			2,660,000
Closing expense including rent and other lease charges			(74,000)
Payments			(522,000)
Other adjustments			(138,000)
Ending balance	1,926,000		1,926,000
Restaurants open more than one year with rolling 12-month negative cash flows [Abstract]
Restaurants open more than a year with negative cash flows			30
Negative cash flows rolling months period (in months)			12M
Negative cash flow restaurants recorded at salvage value			21
Negative cash flow restaurants not recorded at salvage value			9
Negative cash flow restaurants not recorded at salvage value, remaining net book value.	$ 13,300,000		$ 13,300,000