Condensed Consolidated Statement of Changes in Stockholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total
Balance at Dec. 27, 2011	$ 18	$ 51,341	$ 44,513		$ 95,872
Balance, shares at Dec. 27, 2011	17,994,667
Comprehensive income			6,189		6,189
Share-based compensation costs		103			103
Issuance of common stock for initial public offering net of fees and issuance costs	6	66,453			66,459
Issuance of common stock for initial public offering net of fees and issuance costs, shares	5,800,000
Contribution by majority shareholder (see Note 5)		1,440			1,440
Balance at Sep. 04, 2012	24	119,337	50,702		170,063
Balance, shares at Sep. 04, 2012	23,794,667
Balance at Dec. 25, 2012	24	119,610	58,267		177,901
Balance, shares at Dec. 25, 2012	23,794,667				23,794,667
Comprehensive income			7,620		7,620
Share-based compensation costs		871			871
Stock option exercises, including tax effects		262			262
Stock option exercises, including tax effects, shares	17,025				17,025
Contribution by majority shareholder (see Note 5)		5,431			5,431
Balance at Sep. 03, 2013	$ 24	$ 126,174	$ 65,887		$ 192,085
Balance, shares at Sep. 03, 2013	23,811,692				23,811,692