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Acquisitions - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 02, 2021 | Sep. 26, 2020 | Oct. 02, 2021 | Sep. 26, 2020
Pro Forma Information |  |  |  |
Cost of revenue | $ 116,096 | $ 86,294 | $ 323,337 | $ 263,510
Selling, general, and administrative expenses | 52,316 | 43,853 | 151,014 | 134,518
The Clouth Group of Companies |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue | 201,372 | 166,687 | 593,500 | 501,484
Net Income Attributable to Kadant | $ 22,125 | $ 17,013 | $ 64,102 | $ 37,106
Earnings per Share Attributable to Kadant: |  |  |  |
Basic (in dollars per share) | $ 1.91 | $ 1.48 | $ 5.54 | $ 3.23
Diluted (in dollars per share) | $ 1.90 | $ 1.47 | $ 5.51 | $ 3.21
The Clouth Group of Companies | Fair Value Adjustment to Inventory |  |  |  |
Pro Forma Information |  |  |  |
Cost of revenue | $ 1,846 |  | $ 1,846 | $ 3,098
The Clouth Group of Companies | Acquisition-related Costs |  |  |  |
Pro Forma Information |  |  |  |
Selling, general, and administrative expenses |  |  |  | $ 2,143
Amortization | $ 860 |  | $ 2,096 |

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