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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
	Mar. 30, 2019	Mar. 31, 2018
Amounts Attributable to Kadant:
Net Income Attributable to Kadant	$ 10,900	$ 10,858
Basic Weighted Average Shares (in shares)	11,133	11,042
Effect of Stock Options, Restricted Stock Units and Employee Stock Purchase Plan Shares (in shares)	252	300
Diluted Weighted Average Shares (in shares)	11,385	11,342
Basic Earnings per Share (in dollars per share)	$ 0.98	$ 0.98
Diluted Earnings per Share (in dollars per share)	$ 0.96	$ 0.96

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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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