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Quarterly Financial Data Dividends and stock prices (Details) - $ / shares
3 Months Ended 12 Months Ended
Dec. 30, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2016
Oct. 01, 2016
Jul. 02, 2016
Apr. 02, 2016
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Dividends per share $ 0.54 $ 0.54 $ 0.52 $ 0.52 $ 0.52 $ 0.52 $ 0.50 $ 0.50 $ 2.12 $ 2.04 $ 1.98
Market Price Of Common Stock High 68.29 70.36 73.49 76.44 77.25 86.98 81.65 77.86 68.29 77.25  
Market Price Of Common Stock Low $ 58.87 $ 62.37 $ 68.69 $ 71.38 $ 70.96 $ 77.13 $ 74.30 $ 69.96 $ 58.87 $ 70.96