Acquired Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross Carrying Amount	$ 50,583	$ 49,082
Finite-Lived Intangible Assets, Accumulated Amortization	30,798	29,391
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross Carrying Amount	24,515	24,515
Finite-Lived Intangible Assets, Accumulated Amortization	23,506	23,322
Non-compete agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross Carrying Amount	2,749	2,749
Finite-Lived Intangible Assets, Accumulated Amortization	2,625	2,545
Customer lists [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross Carrying Amount	13,963	13,913
Finite-Lived Intangible Assets, Accumulated Amortization	4,520	3,403
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross Carrying Amount	8,181	7,905
Finite-Lived Intangible Assets, Accumulated Amortization	124	121
Developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross Carrying Amount	475	0
Finite-Lived Intangible Assets, Accumulated Amortization	16	0
Licensing agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross Carrying Amount	700	0
Finite-Lived Intangible Assets, Accumulated Amortization	$ 7	$ 0