GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 26, 2020	Dec. 28, 2019	Jun. 27, 2020
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Goodwill	$ 54,293	$ 54,293	$ 54,300
Accumulated Amortization	(41,449)	(37,015)
Gross carrying amount	133,021	127,865
Net carrying amount	91,572	90,850
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Carrying amount, indefinite-lived	13,082	9,245
Gross carrying amount, finite-lived	18,864	19,872
Accumulated Amortization	(5,562)	(4,307)
Net carrying amount, finite-lived	13,302	15,565
Customer relationships
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Gross carrying amount, finite-lived	42,205	42,205
Accumulated Amortization	(31,824)	(28,947)
Net carrying amount, finite-lived	$ 10,381	$ 13,258
Useful Life	11 years	11 years
Patents
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Gross carrying amount, finite-lived	$ 9,497	$ 7,407
Accumulated Amortization	(973)	(719)
Net carrying amount, finite-lived	8,524	6,688
Non-compete agreements
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Gross carrying amount, finite-lived	2,815	2,815
Accumulated Amortization	$ (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	$ 1,043	$ 1,041
Accumulated Amortization	(275)	(227)
Net carrying amount, finite-lived	$ 768	$ 814
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
Trade dress
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Carrying amount, indefinite-lived	$ 14,152	$ 13,917
Minimum | Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Useful Life	6 years	6 years
Minimum | Patents
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Useful Life	4 years	4 years
Maximum | Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Useful Life	30 years	30 years
Maximum | Patents
Finite Lived And Indefinite Lived Intangible Assets By Major Class Line Items
Useful Life	25 years	25 years