CLOSURES AND IMPAIRMENTS EXPENSE (Details) (USD $)	3 Months Ended		9 Months Ended
	Feb. 28, 2012	Mar. 01, 2011	Feb. 28, 2012	Mar. 01, 2011
Impairment Expense [Abstract]
Property impairments	$ 11,534,000	$ 888,000	$ 12,370,000	$ 2,226,000
Closed restaurant lease reserves	776,000	(432,000)	702,000	231,000
Other closing costs	125,000	150,000	541,000	232,000
(Gain)/loss on sale of surplus properties	(118,000)	177,000	(198,000)	180,000
Total closure and impairments expenses	12,317,000	783,000	13,415,000	2,869,000
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Property impairments	11,534,000	888,000	12,370,000	2,226,000
Closed Location Lease Obligation [Roll Forward]
Beginning balance			2,660,000
Closing expense including rent and other lease charges			702,000
Payments			(685,000)
Other adjustments			(138,000)
Ending balance	2,539,000		2,539,000
Restaurants open more than one year with rolling 12-month negative cash flows [Abstract]
Restaurants open more than a year with negative cash flows			37
Negative cash flows rolling months period (in months)			12M
Negative cash flow restaurants impaired at salvage value			28
Negative cash flow restaurants not recorded at salvage value			9
Negative cash flow restaurants not recorded at salvage value, remaining net book value.	12,200,000		12,200,000
April 2012 Restaurant Group Approved For Future Closure [Member]
Impairment Expense [Abstract]
Property impairments			9,600,000
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Property impairments			$ 9,600,000
Number of restaurants approved in plan to be closed, minimum	25		25
Number of restaurants approved in plan to be closed, maximum	27		27
Number of restaurants planned to be closed following expiration of lease	10		10