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REVENUE RECOGNITION - Disaggregated revenue (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020 USD ($) item	Jun. 29, 2019 USD ($)	Jun. 27, 2020 USD ($) item	Jun. 29, 2019 USD ($)	Dec. 28, 2019 USD ($)
Revenue Recognition
Retained earnings	$ 1,057,817	$ 917,704	$ 1,057,817	$ 917,704	$ 995,022
Number of markets in which the entity operates (in markets) | item	3		3
Total Gross Sales	$ 1,273,509	1,264,507	$ 2,324,215	2,296,112
Sales Allowances	(31,508)	(24,690)	(50,152)	(41,169)
Total Net Sales	$ 1,242,001	1,239,817	$ 2,274,063	2,254,943
Change %	0.70%		1.20%
Change % in sales allowances	27.60%		21.80%
Change % in net sales	0.20%		0.80%
FOB Shipping Point Revenue
Revenue Recognition
Total Gross Sales	$ 1,241,167	1,220,844	$ 2,259,073	2,217,667
Change %	1.70%		1.90%
Construction Contract Revenue
Revenue Recognition
Total Gross Sales	$ 32,342	$ 43,663	$ 65,142	$ 78,445
Change %	(25.90%)		(17.00%)
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-06-28 | 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]: 2020-06-28 | Construction Contract Revenue
Revenue Recognition
Number of months to complete contract projects	18 months		18 months

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