CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - shares	9 Months Ended
	Sep. 24, 2016	Sep. 26, 2015
Statement of Stockholders' Equity [Abstract]
Purchase of treasury shares, shares acquired (in shares)	245,798	989,821
Stock plan exercises; shares acquired (in shares)	10,747	82,989
Stock options exercised; shares issued (in shares)	62,535	119,687
Stock awards; shares issued (in shares)	6,976	4,846