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Acquisitions - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 30, 2024 | Apr. 01, 2023
Pro Forma Information |  |
Increase (decrease) in cost of revenue | $ 138,013 | $ 127,712
Increase (decrease) in selling, general, and administrative expenses | 70,305 | 58,562
2024 Acquisitions |  |
Business Acquisition [Line Items] |  |
Revenue | 251,640 | 257,391
Net Income Attributable to Kadant | $ 27,310 | $ 24,824
Earnings per Share Attributable to Kadant |  |
Basic (in dollars per share) | $ 2.33 | $ 2.13
Diluted (in dollars per share) | $ 2.33 | $ 2.12
2024 Acquisitions | Fair Value Adjustment to Inventory |  |
Pro Forma Information |  |
Increase (decrease) in cost of revenue |  | $ 2,331
2024 Acquisitions | Adjustment, Fair Value Adjustment To Inventory |  |
Pro Forma Information |  |
Increase (decrease) in cost of revenue | $ (2,331) |
2024 Acquisitions | Acquisition-Related Costs And Intangible Asset Amortization |  |
Pro Forma Information |  |
Increase (decrease) in selling, general, and administrative expenses |  | $ 1,923
2024 Acquisitions | Adjustment, Acquisition-Related Costs And Intangible Asset Amortization |  |
Pro Forma Information |  |
Increase (decrease) in selling, general, and administrative expenses | $ (1,923) |

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