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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
Apr. 01, 2023
Apr. 02, 2022
Income Amounts Attributable to Parent, Disclosures [Abstract]    
Net Income Attributable to Kadant $ 28,075 $ 41,192
Basic Weighted Average Shares 11,681 11,630
Effect of Stock Options, Restricted Stock Units and Employee Stock Purchase Plan Shares 13 25
Diluted Weighted Average Shares 11,694 11,655
Basic Earnings per Share (in dollars per share) $ 2.40 $ 3.54
Diluted Earnings per Share (in dollars per share) $ 2.40 $ 3.53