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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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