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Earnings per Share - Computation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 02, 2021
Sep. 26, 2020
Jun. 27, 2020
Mar. 28, 2020
Dec. 28, 2019
Sep. 28, 2019
Jun. 29, 2019
Mar. 30, 2019
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Earnings Per Share [Abstract]                      
Net Income Attributable to Kadant $ 16,207 $ 14,851 $ 11,607 $ 12,531 $ 8,749 $ 16,115 $ 16,304 $ 10,900 $ 55,196 $ 52,068 $ 60,413
Basic Weighted Average Shares                 11,482 11,235 11,086
Effect of Stock Options, Restricted Stock Units and Employee Stock Purchase Plan Shares                 82 222 314
Diluted Weighted Average Shares                 11,564 11,457 11,400
Basic (in dollars per share) $ 1.41 $ 1.29 $ 1.01 $ 1.10 $ 0.77 $ 1.43 $ 1.46 $ 0.98 $ 4.81 $ 4.63 $ 5.45
Diluted (in dollars per share) $ 1.40 $ 1.28 $ 1.00 $ 1.09 $ 0.76 $ 1.41 $ 1.42 $ 0.96 $ 4.77 $ 4.54 $ 5.30