Business Segments (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 28, 2015 USD ($)	Jun. 29, 2014 USD ($)	Mar. 31, 2013 USD ($)	Jun. 28, 2015 USD ($) segment	Jun. 29, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment				3
Net revenues	$ 147,550	$ 170,925		$ 276,092	$ 318,331
Gross profit	61,497	72,507		118,034	134,793
Operating expenses	65,985	59,520		122,856	119,640
Interest expense, net	(758)	(914)		(1,469)	(1,903)
Other gain (loss), net	(859)	(442)		(488)	(528)
(Loss) earnings before income taxes	$ (6,105)	$ 11,631		$ (6,779)	$ 12,722
Concentration risk, percentage	10.00%	10.00%		10.00%	10.00%
Restructuring expense	$ 284	$ 341		$ 1,588	$ 2,233
Litigation settlement	8,980	0	$ (6,600)	8,980	0
Acquisition costs	41	0		120	0
Chief Financial Officer
Segment Reporting Information [Line Items]
Operating expenses				800
Merchandise Availability Solutions | Electronic Article Surveillance (EAS) Systems
Segment Reporting Information [Line Items]
Net revenues	33,900	46,400		65,200	86,500
Merchandise Availability Solutions | Alpha Business
Segment Reporting Information [Line Items]
Net revenues	26,100	30,700		47,200	55,500
Merchandise Availability Solutions | Electronic Article Surveillance (EAS) Consumables
Segment Reporting Information [Line Items]
Net revenues	24,300	28,300		46,400	52,700
Operating Segments | Merchandise Availability Solutions
Segment Reporting Information [Line Items]
Net revenues	91,327	111,478		172,853	204,942
Gross profit	43,122	51,262		84,407	95,204
Operating Segments | Apparel Labeling Solutions
Segment Reporting Information [Line Items]
Net revenues	46,942	47,659		84,127	89,740
Gross profit	14,843	17,251		26,391	31,336
Operating Segments | Retail Merchandising Solutions
Segment Reporting Information [Line Items]
Net revenues	9,281	11,788		19,112	23,649
Gross profit	$ 3,532	$ 3,994		$ 7,236	$ 8,253