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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. 02, 2021
Sep. 26, 2020
Oct. 02, 2021
Sep. 26, 2020
Income Amounts Attributable to Parent, Disclosures [Abstract]        
Net Income Attributable to Kadant $ 20,461 $ 14,851 $ 59,886 $ 38,989
Basic Weighted Average Shares (in shares) 11,580 11,504 11,571 11,472
Effect of Stock Options, Restricted Stock Units and Employee Stock Purchase Plan Shares (in shares) 88 85 73 78
Diluted Weighted Average Shares (in shares) 11,668 11,589 11,644 11,550
Basic Earnings per Share (in dollars per share) $ 1.77 $ 1.29 $ 5.18 $ 3.40
Diluted Earnings per Share (in dollars per share) $ 1.75 $ 1.28 $ 5.14 $ 3.38