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Acquisition - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Pro Forma Information
Nonrecurring adjustments	$ 16,115	$ 18,784	$ 43,319	$ 41,991
Syntron Material Handling Group, LLC
Business Acquisition [Line Items]
Revenues	173,504	187,084	521,985	533,868
Net Income Attributable to Kadant	$ 16,167	$ 18,564	$ 47,515	$ 38,158
Earnings per Share Attributable to Kadant:
Basic (in dollars per share)	$ 1.43	$ 1.67	$ 4.24	$ 3.44
Diluted (in dollars per share)	$ 1.41	$ 1.63	$ 4.16	$ 3.35
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			3,549	(3,549)
Syntron Material Handling Group, LLC | Intangible amortization related to acquired backlog
Pro Forma Information
Nonrecurring adjustments	$ 21	$ (21)	$ 1,303	$ (1,303)

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Business Acquisition, Pro Forma Earnings Per Share [Abstract]

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