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Weighted-Average Shares (Tables)
9 Months Ended
Oct. 02, 2011
Weighted-Average Shares [Abstract] 
Calculation of weighted-average shares
                                 
    Three-months Ended     Nine-months Ended  
    October 2,     October 3,     October 2,     October 3,  
    2011     2010     2011     2010  
Basic weighted-average common shares outstanding
    42,128       39,729       41,765       39,693  
Effect of dilutive stock options
    848       188       917       99  
 
                       
Weighted-average common and common-equivalent shares outstanding
    42,976       39,917       42,682       39,792