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Acquisitions - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Earnings per Share Attributable to Kadant: |  |  |  |  |  |  |  |  |  |  |
Net Income Attributable to Kadant | $ 18,422 | $ 18,784 | $ 12,349 | $ 10,858 | $ 760 | $ 13,285 | $ 8,096 | $ 8,951 | $ 60,413 | $ 31,092 | $ 32,077
NII FPG and Unaflex, LLC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 565,710 | 508,832
Net Income Attributable to Kadant |  |  |  |  |  |  |  |  |  | $ 44,159 | $ 30,638
Earnings per Share Attributable to Kadant: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 4.02 | $ 2.82
Diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 3.90 | $ 2.75
NII FPG and Unaflex, LLC | Acquisition-related transaction costs |  |  |  |  |  |  |  |  |  |  |
Earnings per Share Attributable to Kadant: |  |  |  |  |  |  |  |  |  |  |
Net Income Attributable to Kadant |  |  |  |  |  |  |  |  |  | $ 5,360 | $ (5,360)
NII FPG and Unaflex, LLC | Inventory revalued |  |  |  |  |  |  |  |  |  |  |
Earnings per Share Attributable to Kadant: |  |  |  |  |  |  |  |  |  |  |
Net Income Attributable to Kadant |  |  |  |  |  |  |  |  |  | 5,137 | (5,137)
NII FPG and Unaflex, LLC | Intangible amortization related to acquired backlog |  |  |  |  |  |  |  |  |  |  |
Earnings per Share Attributable to Kadant: |  |  |  |  |  |  |  |  |  |  |
Net Income Attributable to Kadant |  |  |  |  |  |  |  |  |  | 1,438 | $ (1,669)
NII FPG and Unaflex, LLC | Income related to gain on sale of building |  |  |  |  |  |  |  |  |  |  |
Earnings per Share Attributable to Kadant: |  |  |  |  |  |  |  |  |  |  |
Net Income Attributable to Kadant |  |  |  |  |  |  |  |  |  | $ (852) |

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