Operating Results by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2013	Dec. 01, 2012	Nov. 30, 2013	Dec. 01, 2012
Segment Reporting Information [Line Items]
Net Sales	$ 35,436	$ 36,603	$ 69,693	$ 72,253
Gross Profit	11,007	10,742	21,199	21,388
EDG
Segment Reporting Information [Line Items]
Net Sales	26,163	26,186	51,642	51,813
Gross Profit	8,507	7,930	16,366	15,930
Canvys
Segment Reporting Information [Line Items]
Net Sales	9,273	10,417	18,051	20,440
Gross Profit	$ 2,500	$ 2,812	$ 4,833	$ 5,458