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Earnings per Share - Computation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 29, 2018
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 30, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]                      
Income from Continuing Operations                 $ 60,413 $ 31,092 $ 32,074
Income from Discontinued Operation                 0 0 3
Net Income Attributable to Kadant $ 18,422 $ 18,784 $ 12,349 $ 10,858 $ 760 $ 13,285 $ 8,096 $ 8,951 $ 60,413 $ 31,092 $ 32,077
Basic Weighted Average Shares                 11,086 10,991 10,869
Effect of Stock Options, Restricted Stock Units and Employee Stock Purchase Plan Shares                 314 321 280
Diluted Weighted Average Shares                 11,400 11,312 11,149
Basic EPS                      
Continuing Operations (in dollars per share)                 $ 5.45 $ 2.83 $ 2.95
Discontinued Operation (in dollars per share)                 0.00 0.00 0.00
Net Income per Basic Share (in dollars per share) $ 1.66 $ 1.69 $ 1.11 $ 0.98 $ 0.07 $ 1.21 $ 0.74 $ 0.82 5.45 2.83 2.95
Diluted EPS                      
Continuing Operations (in dollars per share)                 5.30 2.75 2.88
Discontinued Operation (in dollars per share)                 0.00 0.00 0.00
Net Income per Diluted Share (in dollars per share) $ 1.61 $ 1.64 $ 1.08 $ 0.96 $ 0.07 $ 1.17 $ 0.72 $ 0.80 $ 5.30 $ 2.75 $ 2.88