Quarterly Financial Data Dividends and stock prices (Details) - $ / shares	3 Months Ended								12 Months Ended
	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Quarterly Financial Information Disclosure [Abstract]
Dividends per share	$ 0.50	$ 0.50	$ 0.49	$ 0.49	$ 0.49	$ 0.49	$ 0.46	$ 0.46	$ 1.98	$ 1.90	$ 1.80
Market Price Of Common Stock High	73.51	69.77	66.38	69.84	67.24	66.41	69.39	62.13	73.51	67.24
Market Price Of Common Stock Low	$ 66.03	$ 62.74	$ 61.31	$ 61.97	$ 59.70	$ 59.83	$ 62.62	$ 56.90	$ 66.03	$ 59.70