Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 30, 2017
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Accumulated amortization	$ (29,876)		$ (29,876)		$ (25,936)
Gross carrying amount	110,989		110,989		100,238
Net carrying amount	81,113		81,113		74,302
Amortization expense	1,400	$ 1,200	3,900	$ 4,100
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Gross carrying amount, finite-lived	13,663		13,663		10,627
Accumulated amortization	(2,360)		(2,360)		(1,494)
Net carrying amount, finite-lived	11,303		$ 11,303		$ 9,133
Trademarks | Minimum
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Useful Life			6 years		6 years
Trademarks | Maximum
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Useful Life			30 years		30 years
Customer relationships
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Gross carrying amount, finite-lived	42,205		$ 42,205		$ 42,205
Accumulated amortization	(24,151)		(24,151)		(21,273)
Net carrying amount, finite-lived	18,054		$ 18,054		$ 20,932
Useful Life			11 years		11 years
Patents
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Gross carrying amount, finite-lived	5,090		$ 5,090		$ 3,868
Accumulated amortization	(404)		(404)		(256)
Net carrying amount, finite-lived	4,686		$ 4,686		$ 3,612
Patents | Minimum
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Useful Life			4 years		4 years
Patents | Maximum
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Useful Life			25 years		25 years
Non-compete agreements
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Gross carrying amount, finite-lived	2,815		$ 2,815		$ 2,815
Accumulated amortization	(2,815)		$ (2,815)		$ (2,815)
Useful Life			5 years		5 years
Other intangibles
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Gross carrying amount, finite-lived	1,021		$ 1,021		$ 1,024
Accumulated amortization	(146)		(146)		(98)
Net carrying amount, finite-lived	875		$ 875		$ 926
Useful Life			15 years		15 years
Tradename
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Carrying amount, indefinite-lived	31,363		$ 31,363		$ 31,363
Trade dress
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Carrying amount, indefinite-lived	$ 14,832		$ 14,832		$ 8,336