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REVENUE RECOGNITION - Disaggregated revenue (Details) $ in Thousands	3 Months Ended
	Mar. 28, 2020 USD ($) item	Mar. 30, 2019 USD ($)	Dec. 28, 2019 USD ($)
Revenue Recognition
Retained earnings	$ 998,996	$ 875,457	$ 995,022
Number of markets in which the entity operates (in markets) | item	3
Total Gross Sales	$ 1,050,706	1,031,605
Sales Allowances	(18,644)	(16,480)
Total Net Sales	$ 1,032,062	1,015,125
Change %	1.90%
Change % in sales allowances	13.10%
Change % in net sales	1.70%
FOB Shipping Point Revenue
Revenue Recognition
Total Gross Sales	$ 1,017,906	996,823
Change %	2.10%
Construction Contract Revenue
Revenue Recognition
Total Gross Sales	$ 32,800	$ 34,782
Change %	(5.70%)
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-03-29 | Construction Contract Revenue
Revenue Recognition
Number of months to complete contract projects	6 months
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-03-29 | Construction Contract Revenue
Revenue Recognition
Number of months to complete contract projects	18 months

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