CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
Cash dividends, per share	$ 0.855	$ 0.705	$ 0.645
Purchase of treasury shares, shares		53,847	12,351
Stock plan exercises; shares acquired	174,943	184,639	109,711
Stock options exercised; shares issued	341,090	306,218	43,104
Stock awards; shares issued	20,998	23,968	9,088