Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data	Jul. 02, 2011	Jan. 01, 2011
Current assets:
Accounts receivable, allowance for doubtful accounts	$ 306	$ 302
Shareholders' equity:
Undesignated preferred stock, shares authorized (in shares)	5,000	5,000
Undesignated preferred stock, shares issued (in shares)	0	0
Undesignated preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	142,500	142,500
Common stock, shares issued (in shares)	55,991	55,455
Common stock, shares outstanding (in shares)	55,991	55,455