Consolidated Statements of Stockholders' Equity Parenthetical - shares	3 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Common stock, shares issued under Directors' Stock Plan		29,001			39,711
Common stock, shares purchased			(11,299)		(500)	(19,726)
Restricted stock, shares issued				10,000		297,292
Restricted stock, shares forfeited	(11,103)		(6,681)		(6,196)
Class B common stock converted into class A common stock, shares			2,635			6,250