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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 9 Months Ended
Sep. 27, 2025
Sep. 28, 2024
Sep. 27, 2025
Sep. 28, 2024
Income Amounts Attributable to Parent, Disclosures [Abstract]        
Net Income Attributable to Kadant $ 27,722 $ 31,586 $ 77,944 $ 87,566
Basic Weighted Average Shares 11,777 11,745 11,771 11,737
Effect of Restricted Stock Units and Employee Stock Purchase Plan Shares 25 35 19 26
Diluted Weighted Average Shares 11,802 11,780 11,790 11,763
Basic Earnings per Share (in dollars per share) $ 2.35 $ 2.69 $ 6.62 $ 7.46
Diluted Earnings per Share (in dollars per share) $ 2.35 $ 2.68 $ 6.61 $ 7.44