CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 27, 2011	Dec. 28, 2010
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	85,550,409	84,912,101
Treasury stock, shares	30,222,885	25,204,104
Preferred stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Junior participating cumulative preferred stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	150,000	150,000
Preferred stock, shares issued	0	0