Quarterly Financial Data (unaudited) (Dividends and stock prices) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Quarterly Financial Data [Abstract]
Dividend per share	$ 0.4400	$ 0.4400	$ 0.4300	$ 0.4300	$ 0.4300	$ 0.4300	$ 0.4050	$ 0.4050	$ 1.740	$ 1.670	$ 1.560
High stock price	$ 57.21	$ 52.15	$ 54.20	$ 53.86	$ 55.30	$ 56.39	$ 57.70	$ 55.41	$ 57.21	$ 55.30
Low stock price	$ 51.27	$ 46.33	$ 47.88	$ 49.07	$ 48.10	$ 50.38	$ 53.45	$ 49.99	$ 51.27	$ 48.10