CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Statement of Stockholders' Equity [Abstract]
Cash dividends per share (in dollars per share)	$ 1.50	$ 1.375	$ 0.975
Number of shares acquired	1,435,488	2,711,149
Stock plan exercises; shares acquired (in shares)	112,995	97,974	103,023
Stock options exercised; shares issued (in shares)	169,493	194,627	216,105
Stock awards; shares issued (in shares)	10,329	22,010	33,721