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Acquisitions - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Earnings per Share Attributable to Kadant: |  |  |  |  |  |  |  |  |  |  |
Nonrecurring adjustments | $ 760 | $ 13,285 | $ 8,096 | $ 8,951 | $ 7,733 | $ 9,157 | $ 8,311 | $ 6,876 | $ 31,092 | $ 32,077 | $ 34,389
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: |  |  |  |  |  |  |  |  |  |  |
Nonrecurring adjustments |  |  |  |  |  |  |  |  | $ 5,360 | $ (5,360) |
NII FPG and Unaflex, LLC | Inventory revalued |  |  |  |  |  |  |  |  |  |  |
Earnings per Share Attributable to Kadant: |  |  |  |  |  |  |  |  |  |  |
Nonrecurring adjustments |  |  |  |  |  |  |  |  | 5,137 | (5,137) |
NII FPG and Unaflex, LLC | Intangible amortization related to acquired backlog |  |  |  |  |  |  |  |  |  |  |
Earnings per Share Attributable to Kadant: |  |  |  |  |  |  |  |  |  |  |
Nonrecurring adjustments |  |  |  |  |  |  |  |  | 1,438 | (1,669) |
NII FPG and Unaflex, LLC | Gain on sale of building |  |  |  |  |  |  |  |  |  |  |
Earnings per Share Attributable to Kadant: |  |  |  |  |  |  |  |  |  |  |
Nonrecurring adjustments |  |  |  |  |  |  |  |  | $ (852) |  |
PAAL |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 427,273 | 444,350
Net Income Attributable to Kadant |  |  |  |  |  |  |  |  |  | $ 35,321 | $ 33,881
Earnings per Share Attributable to Kadant: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 3.25 | $ 3.12
Diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 3.17 | $ 3.05
PAAL | Acquisition-related transaction costs |  |  |  |  |  |  |  |  |  |  |
Earnings per Share Attributable to Kadant: |  |  |  |  |  |  |  |  |  |  |
Nonrecurring adjustments |  |  |  |  |  |  |  |  |  | $ 1,832 | $ (1,832)
PAAL | Inventory revalued |  |  |  |  |  |  |  |  |  |  |
Earnings per Share Attributable to Kadant: |  |  |  |  |  |  |  |  |  |  |
Nonrecurring adjustments |  |  |  |  |  |  |  |  |  | 458 | (458)
PAAL | Intangible amortization related to acquired backlog |  |  |  |  |  |  |  |  |  |  |
Earnings per Share Attributable to Kadant: |  |  |  |  |  |  |  |  |  |  |
Nonrecurring adjustments |  |  |  |  |  |  |  |  |  | 1,468 | (1,468)
PAAL | Pre-acquisition debt |  |  |  |  |  |  |  |  |  |  |
Earnings per Share Attributable to Kadant: |  |  |  |  |  |  |  |  |  |  |
Nonrecurring adjustments |  |  |  |  |  |  |  |  |  | $ 454 | $ 1,636

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