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REVENUE RECOGNITION - Disaggregated revenue (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020 USD ($) item	Sep. 28, 2019 USD ($)	Sep. 26, 2020 USD ($) item	Sep. 28, 2019 USD ($)	Dec. 28, 2019 USD ($)
Revenue Recognition
Retained earnings	$ 1,127,375	$ 969,564	$ 1,127,375	$ 969,564	$ 995,022
Number of markets in which the entity operates (in markets) | item	3		3
Total Gross Sales	$ 1,522,057	1,184,030	$ 3,846,272	3,480,142
Sales Allowances	(35,830)	(21,004)	(85,982)	(62,173)
Total Net Sales	$ 1,486,227	1,163,026	$ 3,760,290	3,417,969
Change %	28.50%		10.50%
Change % in sales allowances	70.60%		38.30%
Change % in net sales	27.80%		10.00%
FOB Shipping Point Revenue
Revenue Recognition
Total Gross Sales	$ 1,490,050	1,140,853	$ 3,749,122	3,358,520
Change %	30.60%		11.60%
Construction Contract Revenue
Revenue Recognition
Total Gross Sales	$ 32,007	$ 43,177	$ 97,150	$ 121,622
Change %	(25.90%)		(20.10%)
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-09-27 | Construction Contract Revenue
Revenue Recognition
Number of months to complete contract projects	6 months		6 months
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-09-27 | Construction Contract Revenue
Revenue Recognition
Number of months to complete contract projects	18 months		18 months

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