CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 25, 2010	Dec. 26, 2009
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
Cash dividends, per share	$ 0.705	$ 0.645	$ 0.580
Purchase of treasury shares, shares	53,847	12,351	8,943
Stock plan exercises; shares acquired	184,639	109,711	112,901
Stock options exercised; shares issued	306,218	43,104	186,120
Stock awards; shares issued	23,968	9,088