Contingencies (Narrative) (Details) - USD ($)			3 Months Ended				9 Months Ended
	Aug. 18, 2015	Jun. 26, 2015	Sep. 27, 2015	Sep. 28, 2014	Mar. 31, 2013	Dec. 25, 2011	Sep. 27, 2015	Sep. 28, 2014	Nov. 02, 2011	Dec. 28, 2008
Loss Contingencies [Line Items]
Loss contingency accrual										$ 5,700,000
Estimated litigation liability									$ 6,600,000
Loss contingency accrual, provision						$ 900,000
Litigation settlement			$ (6,584,000)	$ 0	$ 6,600,000		$ (15,564,000)	$ 0
Loss contingency, damages sought							65,000,000
Pending Litigation | All-Tag Security Americas, Inc.
Loss Contingencies [Line Items]
Loss Contingency, damages awarded	$ 6,600,000
Loss contingency, damages sought			11,000,000
Loss contingency, range of possible loss, minimum			6,600,000				6,600,000
Loss contingency, range of possible loss, maximum			$ 11,000,000				$ 11,000,000
Settled Litigation | AIG Superior Court of New Jersey
Loss Contingencies [Line Items]
Litigation settlement		$ 9,000,000