CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Statement of Stockholders' Equity [Abstract]
Purchase of treasury shares, shares acquired (in shares)	126,734	309,198	443,463	305,256
Stock plan exercises; shares acquired (in shares)	4,403	1,033	10,499	12,971
Stock options exercised; shares issued (in shares)	12,856	6,191	28,493	52,404
Stock awards; shares issued (in shares)	223	82	10,550	7,774
Cash dividends declared per share (in dollars per share)	$ 0.375	$ 0.375	$ 1.125	$ 1.125