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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		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Amounts Attributable to Kadant:
Net Income Attributable to Kadant	$ 16,304	$ 12,349	$ 27,204	$ 23,207
Basic Weighted Average Shares (in shares)	11,194	11,092	11,164	11,067
Effect of Stock Options, Restricted Stock Units and Employee Stock Purchase Plan Shares (in shares)	254	308	252	304
Diluted Weighted Average Shares (in shares)	11,448	11,400	11,416	11,371
Basic Earnings per Share (in dollars per share)	$ 1.46	$ 1.11	$ 2.44	$ 2.10
Diluted Earnings per Share (in dollars per share)	$ 1.42	$ 1.08	$ 2.38	$ 2.04

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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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