Operating Results by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 31, 2013	Sep. 01, 2012
Segment Reporting Information [Line Items]
Net Sales	$ 34,257	$ 35,650
Gross Profit	10,192	10,646
EDG
Segment Reporting Information [Line Items]
Net Sales	25,479	25,627
Gross Profit	7,859	8,000
Canvys
Segment Reporting Information [Line Items]
Net Sales	8,778	10,023
Gross Profit	$ 2,333	$ 2,646