Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Income Statement [Abstract]
Net sales	$ 802,957	$ 751,476	$ 664,466
Cost of goods sold	494,907	464,275	403,498
Gross profit	308,050	287,201	260,968
Selling, general and administrative expenses	161,893	146,467	133,029
Income from operations	146,157	140,734	127,939
Interest expense, net	216	204	189
Income before income taxes	145,941	140,530	127,750
Provision for income taxes	53,612	50,543	45,830
Net income	$ 92,329	$ 89,987	$ 81,920
Earnings per share:
Basic	$ 2.60	$ 2.50	$ 2.25
Diluted	$ 2.60	$ 2.49	$ 2.24
Weighted average shares outstanding:
Basic	35,466	36,052	36,347
Diluted	35,538	36,190	36,624