VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands		12 Months Ended
		May 27, 2017	May 28, 2016	May 30, 2015
Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		$ 364	$ 283	$ 581
Charged to expense	[1]	226	228	(221)
Deductions	[2]	(192)	(147)	77
Balance at end of period		398	364	283
Inventory Provisions [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		3,380	2,991	3,141
Charged to expense	[3]	456	690	228
Deductions	[4]	380	301	378
Balance at end of period		$ 3,456	$ 3,380	$ 2,991

[1] Charges to bad debt expense, net of bad debt recoveries.

[2] Uncollectible amounts written off, net of recoveries and foreign currency translation.

[3] Charges to cost of sales. Included in fiscal 2017 are inventory write-downs of $0.4 million for PMT and $0.1 million for Canvys, and less than $0.1 million for Healthcare.

[4] Inventory disposed of or sold, net of foreign currency translation.