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Subsequent Event - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Pro Forma Information
Nonrecurring adjustments	$ 8,096	$ 8,311	$ 17,047	$ 15,187
NII FPG [Member]
Subsequent Event [Line Items]
Revenues			252,842	245,548
Net Income Attributable to Kadant			$ 24,010	$ 9,488
Earnings per Share Attributable to Kadant:
Basic (in dollars per share)			$ 2.19	$ 0.88
Diluted (in dollars per share)			$ 2.13	$ 0.86
NII FPG [Member] | Acquisition-related transaction costs [Member]
Pro Forma Information
Nonrecurring adjustments			$ 4,417	$ (4,417)
NII FPG [Member] | Inventory revalued [Member]
Pro Forma Information
Nonrecurring adjustments				(5,822)
NII FPG [Member] | Intangible amortization related to acquired backlog [Member]
Pro Forma Information
Nonrecurring adjustments				$ (1,170)
NII FPG [Member] | Gain on sale of a building [Member]
Pro Forma Information
Nonrecurring adjustments			$ (852)

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

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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