QUARTERLY FINANCIAL DATA (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 683,626	$ 690,340	$ 700,871	$ 692,139	$ 697,363	$ 678,692	$ 682,405	$ 698,684	$ 2,766,976	$ 2,757,144	$ 2,745,967
Gross profit	170,867	176,086	180,414	165,129	149,701	164,340	174,999	169,240	692,496	658,280	681,768
Net earnings, amount	$ 35,747	$ 40,144	$ 41,397	$ 36,481	$ 17,662	$ 4,448	$ 32,960	$ 39,281	$ 153,769	$ 94,351	$ 116,240
Basic (in dollars per share)	$ 1.67	$ 1.86	$ 1.90	$ 1.67	$ 0.80	$ 0.20	$ 1.47	$ 1.74	$ 7.10	$ 4.23	$ 5.16
Diluted (in dollars per share)	1.66	1.85	1.90	1.66	0.80	0.20	1.46	1.72	7.06	4.20	$ 5.11
Stock Price, High (in dollars per share)	151.46	146.46	136.75	139.50	141.38	157.15	154.60	171.55	151.46	171.55
Stock Price, Low (in dollars per share)	123.80	123.74	112.94	107.43	103.01	135.00	137.90	140.10	107.43	103.01
Dividends Declared (in dollars per share)	$ 0.375	$ 0.375	$ 0.375	$ 0.375	$ 0.375	$ 0.375	$ 0.375	$ 0.375	$ 1.50	$ 1.50
Impairment of goodwill and intangible assets						$ 14,736			$ 0	$ 15,780	$ 0
Impairment of goodwill and intangible assets (in dollars per share)						$ 0.66
Refinancing of long-term debt expense						$ 11,115			$ 11,115
Refinancing of long-term debt (in dollars per share)						$ 0.50
Restructuring and related cost, expected cost remaining					$ 20,625					$ 20,625
Restructuring expenses (in dollars per share)										$ 0.92