Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2015	Mar. 30, 2014
Segment Reporting Information [Line Items]
Net revenues	$ 128,542	$ 147,406
Gross profit	56,537	62,286
Operating expenses	56,871	60,120
Interest expense, net	(711)	(989)
Other gain (loss), net	371	(86)
(Loss) earnings before income taxes	$ (674)	$ 1,091
Concentration risk, percentage	10.00%	10.00%
Restructuring expenses	$ 1,304	$ 1,892
Acquisition costs	79	0
Chief Financial Officer
Segment Reporting Information [Line Items]
Operating expenses	800
Merchandise Availability Solutions
Segment Reporting Information [Line Items]
Net revenues	81,526	93,464
Gross profit	41,285	43,942
Merchandise Availability Solutions | Electronic Article Surveillance (EAS) Systems
Segment Reporting Information [Line Items]
Net revenues	31,200	40,100
Merchandise Availability Solutions | Alpha Business
Segment Reporting Information [Line Items]
Net revenues	21,200	24,800
Merchandise Availability Solutions | Electronic Article Surveillance (EAS) Consumables
Segment Reporting Information [Line Items]
Net revenues	22,100	24,300
Apparel Labeling Solutions
Segment Reporting Information [Line Items]
Net revenues	37,185	42,081
Gross profit	11,548	14,085
Retail Merchandising Solutions
Segment Reporting Information [Line Items]
Net revenues	9,831	11,861
Gross profit	$ 3,704	$ 4,259