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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. 31, 2018	Apr. 01, 2017
Amounts Attributable to Kadant:
Net Income	$ 10,858	$ 8,951
Basic Weighted Average Shares (in shares)	11,042	10,952
Effect of Stock Options, Restricted Stock Units and Employee Stock Purchase Plan Shares (in shares)	300	253
Diluted Weighted Average Shares (in shares)	11,342	11,205
Basic Earnings per Share (in dollars per share)	$ 0.98	$ 0.82
Diluted Earnings per Share (in dollars per share)	$ 0.96	$ 0.80

X

- Definition

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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