Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) (Parentheticals) - $ / shares shares in Thousands	3 Months Ended
	Jun. 27, 2020	Mar. 28, 2020	Jun. 29, 2019	Mar. 30, 2019
Statements of Stockholders' Equity (Parenthetical) [Abstract]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.32	$ 0.30	$ 0.30	$ 0.26
Contribution of shares to retirement plans	0	7,398	0	8,587
Acquisition of shares from stockholders	6,714	9,142	5,790	7,802
Sale of shares to stockholders	492	2,239	904	2,641