Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2013	Dec. 30, 2012
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	61,906,424	61,696,806
Treasury stock, shares	44,127,288	43,814,979