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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. 03, 2021	Mar. 28, 2020
Income Amounts Attributable to Parent, Disclosures [Abstract]
Net Income Attributable to Kadant	$ 16,561	$ 12,531
Basic Weighted Average Shares (in shares)	11,553	11,432
Effect of Stock Options, Restricted Stock Units and Employee Stock Purchase Plan Shares (in shares)	59	76
Diluted Weighted Average Shares (in shares)	11,612	11,508
Basic Earnings per Share (in dollars per share)	$ 1.43	$ 1.10
Diluted Earnings per Share (in dollars per share)	$ 1.43	$ 1.09

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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