Stockholders' Equity (Details 3) (Restricted Stock Award Program [Member], USD $)	12 Months Ended
	Jan. 01, 2012	Jan. 02, 2011	Jan. 03, 2010
Restricted Stock Award Program [Member]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Additional Disclosures
Beginning Balance, Shares	109,002	101,340	100,948
Weighted average fair value per share, Beginning Balance	$ 32.22	$ 31.77	$ 28.04
Granted	43,654	41,885	39,204
Weighted average fair value per share, Granted	$ 37.22	$ 29.62	$ 30.97
Issued	(27,913)	(31,307)	(37,100)
Weighted average fair value per share, Issued	$ 37.89	$ 27.71	$ 21.24
Forfeited/Canceled	(7,311)	(2,916)	(1,712)
Weighted average fair value per share, Forfeited/Canceled	$ 30.77	$ 27.71	$ 21.24
Ending Balance, Shares	117,432	109,002	101,340
Weighted average fair value per share, Ending Balance	$ 32.82	$ 32.22	$ 31.77