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Acquisition - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Pro Forma Information
Nonrecurring adjustments	$ 10,900	$ 10,858
Syntron Material Handling Group, LLC
Business Acquisition [Line Items]
Revenues	171,316	170,532
Net Income Attributable to Kadant	$ 14,112	$ 8,475
Earnings per Share Attributable to Kadant:
Basic (in dollars per share)	$ 1.27	$ 0.77
Diluted (in dollars per share)	$ 1.24	$ 0.75
Syntron Material Handling Group, LLC | Acquisition-related transaction costs
Pro Forma Information
Nonrecurring adjustments	$ (843)	$ 843
Syntron Material Handling Group, LLC | Inventory revalued
Pro Forma Information
Nonrecurring adjustments	(2,310)	2,310
Syntron Material Handling Group, LLC | Intangible amortization related to acquired backlog
Pro Forma Information
Nonrecurring adjustments	$ (998)	$ 998

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Business Acquisition, Pro Forma Earnings Per Share [Abstract]

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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