Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Income Statement [Abstract]
Net sales	$ 859,604	$ 802,957	$ 751,476
Cost of goods sold	521,530	494,907	464,275
Gross profit	338,074	308,050	287,201
Selling, general and administrative expenses	169,473	161,893	146,467
Income from operations	168,601	146,157	140,734
Interest expense, net	241	216	204
Income before income taxes	168,360	145,941	140,530
Provision for income taxes	62,311	53,612	50,543
Net income	$ 106,049	$ 92,329	$ 89,987
Earnings per share:
Basic	$ 3.07	$ 2.60	$ 2.50
Diluted	$ 3.07	$ 2.60	$ 2.49
Weighted average shares outstanding:
Basic	34,516	35,466	36,052
Diluted	34,598	35,538	36,190