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Earnings per Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Apr. 04, 2026
Mar. 29, 2025
Income Amounts Attributable to Parent, Disclosures [Abstract]    
Net Income Attributable to Kadant $ 25,509 $ 24,063
Basic Weighted Average Shares 11,794 11,760
Effect of Restricted Stock Units and Employee Stock Purchase Plan Shares 8 16
Diluted Weighted Average Shares 11,802 11,776
Basic Earnings per Share (in dollars per share) $ 2.16 $ 2.05
Diluted Earnings per Share (in dollars per share) $ 2.16 $ 2.04