CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - shares	9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014
Statement of Stockholders' Equity [Abstract]
Purchase of treasury shares, shares acquired (in shares)	1,236,771	2,126,392
Stock plan exercises; shares acquired (in shares)	98,367	83,431
Stock options exercised; shares issued (in shares)	138,657	171,508
Stock awards; shares issued (in shares)	5,943	8,247