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Acquisition - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Pro Forma Information
Nonrecurring adjustments	$ (16,304)	$ (12,349)	$ (27,204)	$ (23,207)
Syntron Material Handling Group, LLC
Business Acquisition [Line Items]
Revenues	177,165	176,252	348,481	346,784
Net Income Attributable to Kadant	$ 17,236	$ 11,119	$ 31,348	$ 19,594
Earnings per Share Attributable to Kadant:
Basic (in dollars per share)	$ 1.54	$ 1.00	$ 2.81	$ 1.77
Diluted (in dollars per share)	$ 1.51	$ 0.98	$ 2.75	$ 1.73
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	$ 1,239	$ (1,239)	(3,549)	(3,549)
Syntron Material Handling Group, LLC | Intangible amortization related to acquired backlog
Pro Forma Information
Nonrecurring adjustments	$ 284	$ (284)	$ (1,282)	$ (1,282)

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Business Acquisition, Pro Forma Earnings Per Share [Abstract]

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