Summary of Significant Accounting Policies (Details 4) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Oct. 01, 2013	Jul. 02, 2013	Apr. 02, 2013	Jan. 01, 2013	Oct. 02, 2012	Jul. 03, 2012	Apr. 03, 2012	Dec. 31, 2013	Jan. 01, 2013	Jan. 03, 2012
Revenue Recognition
Gift card breakage period									3 years
Gift card breakage									$ 4,400,000	$ 5,700,000	$ 2,400,000
Advertising Costs
Advertising costs									5,900,000	5,800,000	6,200,000
Net income per share
Antidilutive securities excluded from calculation of basic earnings per share									1,200,000	2,900,000	3,400,000
Net income per share, basic and diluted
Net income	$ 33,000,000	$ 27,481,000	$ 28,583,000	$ 25,292,000	$ 22,139,000	$ 27,163,000	$ 28,399,000	$ 20,722,000	$ 114,356,000	$ 98,423,000	$ 95,720,000
Basic weighted average shares outstanding (in shares)									52,229,000	53,185,000	56,378,000
Dilutive effect of equity awards (in shares)									2,148,000	2,026,000	1,812,000
Diluted weighted average shares outstanding									54,377,000	55,211,000	58,190,000
Basic net income per share (in dollars per share)	$ 0.64	$ 0.52	$ 0.54	$ 0.48	$ 0.42	$ 0.51	$ 0.53	$ 0.39	$ 2.19	$ 1.85	$ 1.70
Diluted net income per share (in dollars per share)	$ 0.62	$ 0.50	$ 0.52	$ 0.47	$ 0.40	$ 0.49	$ 0.52	$ 0.37	$ 2.10	$ 1.78	$ 1.64
Restricted stock
Net income per share
Antidilutive securities excluded from calculation of basic earnings per share									1,300,000	1,300,000	800,000