CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - shares	3 Months Ended
	Mar. 26, 2016	Mar. 28, 2015
Statement of Stockholders' Equity [Abstract]
Purchase of treasury shares, shares acquired (in shares)	598,227	153,962
Stock plan exercises; shares acquired (in shares)	1,895	16,950
Stock options exercised; shares issued (in shares)	25,119	12,771
Stock awards; shares issued (in shares)	4,540	9,656