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Earnings per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 01, 2016
Oct. 03, 2015
Oct. 01, 2016
Oct. 03, 2015
Amounts Attributable to Kadant:        
Income from Continuing Operations $ 9,154 $ 8,647 $ 24,341 $ 23,948
Income (Loss) from Discontinued Operation 3 (4) 3 56
Net Income Attributable to Kadant $ 9,157 $ 8,643 $ 24,344 $ 24,004
Basic Weighted Average Shares (in shares) 10,901 10,861 10,854 10,900
Effect of Stock Options, Restricted Stock Units and Employee Stock Purchase Plan (in shares) 288 235 266 219
Diluted Weighted Average Shares (in shares) 11,189 11,096 11,120 11,119
Basic Earnings per Share:        
Continuing operations (in dollars per share) $ 0.84 $ 0.80 $ 2.24 $ 2.20
Discontinued operation (in dollars per share) 0.00 0.00 0.00 0.01
Net Income per basic Share (in dollars per share) 0.84 0.80 2.24 2.20
Diluted Earnings per Share:        
Continuing operations (in dollars per share) 0.82 0.78 2.19 2.15
Discontinued operation (in dollars per share) 0.00 0.00 0.00 0.01
Net Income per diluted Share (in dollars per share) $ 0.82 $ 0.78 $ 2.19 $ 2.16