Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares shares in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Statement of Stockholders' Equity [Abstract]
Dividends, per share	$ 1.16	$ 1.0100	$ 0.9125
Contribution of shares to retirement plans	8,587	8,440	8,833
Acquisition of shares from stockholders	24,506	33,770	45,952
Sale of shares to stockholders	7,026	7,335	7,361
Retirement of shares	15,995	25,596	36,975