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Subsequent Event - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 03, 2021 | Jun. 27, 2020 | Jul. 03, 2021 | Jun. 27, 2020
Pro Forma Information |  |  |  |
Cost of revenue | $ 110,493 | $ 86,412 | $ 207,241 | $ 177,216
Selling, general, and administrative expenses | 49,267 | 45,073 | 98,698 | 90,665
The Clouth Group of Companies |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Revenues | 207,740 | 164,248 | 392,128 | 334,796
Net Income Attributable to Kadant | $ 23,663 | $ 10,276 | $ 41,522 | $ 20,147
Earnings per Share Attributable to Kadant: |  |  |  |
Basic (in dollars per share) | $ 2.04 | $ 0.89 | $ 3.59 | $ 1.76
Diluted (in dollars per share) | $ 2.03 | $ 0.89 | $ 3.57 | $ 1.75
The Clouth Group of Companies | Fair Value Adjustment to Inventory |  |  |  |
Pro Forma Information |  |  |  |
Cost of revenue |  | $ 1,753 |  | $ 3,505
The Clouth Group of Companies | Acquisition-related Costs |  |  |  |
Pro Forma Information |  |  |  |
Selling, general, and administrative expenses |  | $ 239 |  | $ 1,673
Amortization | $ 239 |  | $ 1,236 |

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