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Acquisitions - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2024 | Sep. 30, 2023 | Sep. 28, 2024 | Sep. 30, 2023
Pro Forma Information |  |  |  |
Increase (decrease) in cost of revenue | $ 150,175 | $ 138,456 | $ 441,066 | $ 404,671
Increase (decrease) in selling, general, and administrative expenses | 69,043 | 57,889 | 209,352 | 176,441
2024 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue | 271,614 | 278,202 | 806,946 | 821,052
Net Income Attributable to Kadant | $ 33,497 | $ 28,973 | $ 92,264 | $ 80,131
Earnings per Share Attributable to Kadant |  |  |  |
Basic (in dollars per share) | $ 2.85 | $ 2.48 | $ 7.86 | $ 6.85
Diluted (in dollars per share) | $ 2.84 | $ 2.47 | $ 7.84 | $ 6.84
2024 Acquisitions | Fair Value Adjustment to Inventory |  |  |  |
Pro Forma Information |  |  |  |
Increase (decrease) in cost of revenue |  | $ 1,181 |  | $ 4,745
2024 Acquisitions | Adjustment, Fair Value Adjustment To Inventory |  |  |  |
Pro Forma Information |  |  |  |
Increase (decrease) in cost of revenue | $ (1,181) |  | $ (4,041) |
2024 Acquisitions | Acquisition-Related Costs And Intangible Asset Amortization |  |  |  |
Pro Forma Information |  |  |  |
Increase (decrease) in selling, general, and administrative expenses |  | $ 412 |  | 2,535
2024 Acquisitions | Adjustment, Acquisition-Related Costs And Intangible Asset Amortization |  |  |  |
Pro Forma Information |  |  |  |
Increase (decrease) in selling, general, and administrative expenses | (680) |  | (1,855) |
2024 Acquisitions | Acquisition-related Costs |  |  |  |
Pro Forma Information |  |  |  |
Increase (decrease) in selling, general, and administrative expenses |  |  |  | $ 2,533
2024 Acquisitions | Adjustment, Acquisition-Related Costs |  |  |  |
Pro Forma Information |  |  |  |
Increase (decrease) in selling, general, and administrative expenses | $ (469) |  | $ (2,533) |

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