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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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