Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Cash dividend per share	$ 1.00	$ 1.00	$ 1.00
Class B Common Stock [Member]
Cash dividend per share	$ 1.00	$ 1.00	$ 1.00
Class B common stock shares issued	21,020	20,920	20,920