CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 24, 2017	Sep. 25, 2016	Sep. 24, 2017	Sep. 25, 2016
Income Statement [Abstract]
NET SALES	$ 407,511	$ 304,151	$ 1,160,083	$ 897,951
Cost of goods sold	338,328	255,299	961,851	748,463
GROSS PROFIT	69,183	48,852	198,232	149,488
Operating Expenses:
Warehouse and delivery	11,016	9,165	32,442	26,149
Selling, general and administrative	22,756	15,883	63,755	44,921
Amortization of intangible assets	5,237	3,687	14,239	9,680
Total operating expenses	39,009	28,735	110,436	80,750
OPERATING INCOME	30,174	20,117	87,796	68,738
Interest expense, net	2,135	1,917	6,159	5,198
Income before income taxes	28,039	18,200	81,637	63,540
Income taxes	10,094	6,127	24,965	21,523
NET INCOME	$ 17,945	$ 12,073	$ 56,672	$ 42,017
BASIC NET INCOME PER COMMON SHARE (in dollars per share)	$ 1.09	$ 0.80	$ 3.53	$ 2.80
DILUTED NET INCOME PER COMMON SHARE (in dollars per share)	$ 1.08	$ 0.79	$ 3.47	$ 2.76
Weighted average shares outstanding - Basic (in shares)	16,442	15,048	16,044	15,002
Weighted average shares outstanding - Diluted (in shares)	16,688	15,308	16,317	15,246