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Acquisitions - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Jul. 01, 2017 | Sep. 30, 2017 | Oct. 01, 2016 | Dec. 31, 2016
Pro Forma Information |  |  |  |  |  |
Nonrecurring adjustments | $ 13,285 | $ 9,157 |  | $ 30,332 | $ 24,344 |
NII FPG and Unaflex, LLC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Revenues |  |  |  | 416,570 | 383,450 |
Net Income Attributable to Kadant |  |  |  | $ 40,929 | $ 20,680 |
Earnings per Share Attributable to Kadant: |  |  |  |  |  |
Basic (in dollars per share) |  |  |  | $ 3.73 | $ 1.91 |
Diluted (in dollars per share) |  |  |  | $ 3.63 | $ 1.86 |
NII FPG and Unaflex, LLC [Member] | Acquisition-related transaction costs [Member] |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |
Nonrecurring adjustments |  |  |  | $ (5,002) |  | $ 5,002
NII FPG and Unaflex, LLC [Member] | Inventory revalued [Member] |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |
Nonrecurring adjustments |  |  |  | (3,360) | $ 4,986 |
NII FPG and Unaflex, LLC [Member] | Intangible amortization related to acquired backlog [Member] |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |
Nonrecurring adjustments |  |  |  | $ (958) | $ 1,610 |
NII FPG [Member] | Gain on sale of a building [Member] |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |
Nonrecurring adjustments |  |  | $ (852) |  |  |

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