CONSOLIDATED CONDENSED STATEMENTS OF EARNINGS AND COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Mar. 26, 2016
Income Statement [Abstract]
NET SALES	$ 846,130	$ 682,151
COST OF GOODS SOLD	725,390	579,412
GROSS PROFIT	120,740	102,739
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	86,919	70,828
NET LOSS ON DISPOSITION AND IMPAIRMENT OF ASSETS	(64)	(10)
EARNINGS FROM OPERATIONS	33,821	31,911
INTEREST EXPENSE	1,504	1,076
INTEREST INCOME	(82)	(104)
EQUITY IN EARNINGS OF INVESTEE	(5)	(81)
NON-OPERATING (INCOME)/EXPENSE	1,417	891
EARNINGS BEFORE INCOME TAXES	32,404	31,020
INCOME TAXES	10,770	10,765
NET EARNINGS	21,634	20,255
LESS NET EARNINGS ATTRIBUTABLE TO NONCONTROLLING INTEREST	(572)	(1,043)
NET EARNINGS ATTRIBUTABLE TO CONTROLLING INTEREST	$ 21,062	$ 19,212
EARNINGS PER SHARE - BASIC (USD per share)	$ 1.03	$ 0.95
EARNINGS PER SHARE - DILUTED (USD per share)	$ 1.03	$ 0.95
Net earnings	$ 21,634	$ 20,255
OTHER COMPREHENSIVE GAIN	3,035	442
COMPREHENSIVE INCOME	24,669	20,697
LESS COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST	(1,427)	(846)
COMPREHENSIVE INCOME ATTRIBUTABLE TO CONTROLLING INTEREST	$ 23,242	$ 19,851