INCOME TAXES (Details 4) - USD ($) $ in Thousands		12 Months Ended
		May 27, 2017	May 28, 2016
Unrecognized Tax Benefits, beginning of period		$ 2,000	$ 2,000
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions		75	299
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities		(75)
Unrecognized Tax Benefits, Decrease related to the expiration of statute of limitations		(117)	(299)
Unrecognized Tax Benefits, end of period		1,883	2,000
Continuing Operations [Member]
Unrecognized Tax Benefits, beginning of period		117
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities
Unrecognized Tax Benefits, end of period			117
Discontinued Operations [Member]
Unrecognized Tax Benefits, beginning of period	[1]	1,883
Unrecognized Tax Benefits, end of period	[1]	$ 1,883	$ 1,883

[1] Relates to an amended Illinois state income tax return related to the sale of RFPD.