Consolidated Statement Of Changes In Stockholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Total
Balance at Dec. 27, 2011	$ 18	$ 51,341		$ 44,513	$ 95,872
Balance, shares at Dec. 27, 2011	17,994,667
Net income				13,754	13,754
Share-based compensation costs		378			378
Issuance of common stock for initial public offering net of fees and issuance costs	6	66,451			66,457
Issuance of common stock for initial public offering net of fees and issuance costs, shares	5,800,000
Contribution by shareholder (see Note 5)		1,440			1,440
Balance at Dec. 25, 2012	24	119,610		58,267	177,901
Balance, shares at Dec. 25, 2012	23,794,667
Net income				12,212	12,212
Share-based compensation costs		1,689			1,689
Stock option exercises, including tax effects		428			428
Stock option exercises, including tax effects, shares	28,475
Treasury stock purchases			(3,681)
Treasury stock purchases, shares	(196,500)
Contribution by shareholder (see Note 5)		8,234			8,234
Balance at Dec. 31, 2013	24	129,961	(3,681)	70,479	196,783
Balance, shares at Dec. 31, 2013	23,626,642
Net income				16,597	16,597
Share-based compensation costs		2,567			2,567
Stock option exercises, including tax effects		1,355			1,355
Stock option exercises, including tax effects, shares	85,400				85,400
Treasury stock purchases			(6,319)		(6,319)
Treasury stock purchases, shares	(268,996)
Balance at Dec. 30, 2014	$ 24	$ 133,883	$ (10,000)	$ 87,076	$ 210,983
Balance, shares at Dec. 30, 2014	23,443,046