CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 02, 2016	Jul. 03, 2016	Apr. 03, 2016	Dec. 31, 2015	Oct. 04, 2015	Jul. 05, 2015	Apr. 05, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Common stock
Dividends paid per share (USD per share)	$ 0.618	$ 0.618	$ 0.583	$ 0.583	$ 0.583	$ 0.583	$ 0.535	$ 0.535	$ 2.402	$ 2.236	$ 2.04
Class B common stock
Dividends paid per share (USD per share)	$ 0.562	$ 0.562	$ 0.530	$ 0.530	$ 0.53	$ 0.53	$ 0.486	$ 0.486	$ 2.184	$ 2.032	$ 1.842