Consolidated Statements of Stockholders' Equity (USD $)	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Stockholders' Equity, Total [Member]
Balance at Dec. 31, 2011		$ 23,000	$ (385,000)	$ 186,089,000	$ 68,351,000	$ (727,000)	$ 253,351,000
Balance, shares at Dec. 31, 2011		22,991,764
Stockholders' Equity
Net Income	14,719,000				14,719,000		14,719,000
Foreign currency translation adjustment, net of tax of $92	(64,000)					(64,000)	(64,000)
Common stock issued under equity compensation plan, shares		667,281
Common Stock, Value, Issued		1,000
Common stock issued under equity compensation plan, value				6,990,000			6,991,000
Tax benefit (deficiency) from equity issuance, including excess tax benefit				(389,000)			(389,000)
Sale of common stock pursuant to associates stock buying plan, shares	87,095	87,095
Sale of common stock pursuant to associates stock buying plan, value				698,000			698,000
Balance at Dec. 29, 2012		24,000	(385,000)	193,388,000	83,070,000	(791,000)	275,306,000
Balance, shares at Dec. 29, 2012		23,746,140
Stockholders' Equity
Net Income	7,837,000				7,837,000		7,837,000
Foreign currency translation adjustment, net of tax of $92	226,000					226,000	226,000
Common stock issued under equity compensation plan, shares		765,809
Common Stock, Value, Issued	25,000	1,000
Common stock issued under equity compensation plan, value				7,646,000			7,647,000
Tax benefit (deficiency) from equity issuance, including excess tax benefit				807,000			807,000
Treasury Stock, Shares, Acquired		(298,094)
Treasury Stock, Value, Acquired, Cost Method			(4,020,000)				(4,020,000)
Sale of common stock pursuant to associates stock buying plan, shares	82,643	82,642
Sale of common stock pursuant to associates stock buying plan, value				781,000			781,000
Balance at Dec. 28, 2013	288,584,000	25,000	(4,405,000)	202,622,000	90,907,000	(565,000)	288,584,000
Balance, shares at Dec. 28, 2013	24,296,497	24,296,497
Stockholders' Equity
Net Income	1,948,000				1,948,000		1,948,000
Foreign currency translation adjustment, net of tax of $92	1,000					1,000	1,000
Common stock issued under equity compensation plan, shares		391,950
Common Stock, Value, Issued	25,000	0
Common stock issued under equity compensation plan, value				4,760,000			4,760,000
Tax benefit (deficiency) from equity issuance, including excess tax benefit				(173,000)			(173,000)
Treasury Stock, Shares, Acquired		(359,905)
Treasury Stock, Value, Acquired, Cost Method			(4,766,000)				(4,766,000)
Sale of common stock pursuant to associates stock buying plan, shares	75,119	75,119
Sale of common stock pursuant to associates stock buying plan, value				654,000			654,000
Balance at Jan. 03, 2015	$ 291,008,000	$ 25,000	$ (9,171,000)	$ 207,863,000	$ 92,855,000	$ (564,000)	$ 291,008,000
Balance, shares at Jan. 03, 2015	24,403,661	24,403,661