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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 6 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Jul. 03, 2021
Jun. 27, 2020
Income Amounts Attributable to Parent, Disclosures [Abstract]        
Net Income Attributable to Kadant $ 22,864 $ 11,607 $ 39,425 $ 24,138
Basic Weighted Average Shares (in shares) 11,579 11,482 11,566 11,457
Effect of Stock Options, Restricted Stock Units and Employee Stock Purchase Plan Shares (in shares) 71 70 65 73
Diluted Weighted Average Shares (in shares) 11,650 11,552 11,631 11,530
Basic Earnings per Share (in dollars per share) $ 1.97 $ 1.01 $ 3.41 $ 2.11
Diluted Earnings per Share (in dollars per share) $ 1.96 $ 1.00 $ 3.39 $ 2.09