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Earnings per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Jun. 29, 2013
Jun. 30, 2012
Amounts Attributable to Kadant [Abstract]        
Income from Continuing Operations $ 5,772 $ 6,546 $ 11,085 $ 13,660
Loss from Discontinued Operation (12) (3) (41) (64)
Net Income Attributable to Kadant $ 5,760 $ 6,543 $ 11,044 $ 13,596
Basic Weighted Average Shares (in shares) 11,178,000 11,575,000 11,170,000 11,614,000
Effect of Stock Options, Restricted Stock Units and Employee Stock Purchase Plan (in shares) 153,000 104,000 129,000 90,000
Diluted Weighted Average Shares (in shares) 11,331,000 11,679,000 11,299,000 11,704,000
Basic Earnings Per Share [Abstract]        
Continuing operations (in dollars per share) $ 0.52 $ 0.57 $ 0.99 $ 1.18
Discontinued operation (in dollars per share) $ 0 $ 0 $ 0 $ (0.01)
Net Income per Basic Share (in dollars per share) $ 0.52 $ 0.57 $ 0.99 $ 1.17
Diluted Earnings Per Share [Abstract]        
Continuing operations (in dollars per share) $ 0.51 $ 0.56 $ 0.98 $ 1.17
Discontinued operation (in dollars per share) $ 0 $ 0 $ 0 $ (0.01)
Net Income per Diluted Share (in dollars per share) $ 0.51 $ 0.56 $ 0.98 $ 1.16
Stock Options [Member]
        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 92,900 164,400 102,100 135,700
Restricted Stock Units (RSUs) [Member]
        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares)   2,000 41,000 57,000