Condensed consolidated balance sheets (Parenthetical) (USD $)	Jul. 02, 2011	Jan. 01, 2011
Condensed consolidated balance sheets
Preferred stock, shares authorized	15,000,000	15,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	46,324,872	45,582,557
Common stock, shares outstanding	46,324,872	45,582,557