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Unaudited Quarterly Information - Summary of Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 149,140 | $ 152,794 | $ 110,242 | $ 102,857 | $ 100,241 | $ 105,519 | $ 111,828 | $ 96,538 | $ 515,033 | $ 414,126 | $ 390,107
Gross Profit | 64,590 | 64,628 | 52,824 | 48,992 | 46,073 | 48,079 | 50,261 | 43,976 |  |  |
Amounts Attributable to Kadant: |  |  |  |  |  |  |  |  |  |  |
Income from Continuing Operations |  |  |  |  | 7,733 | 9,154 | 8,311 | 6,876 | 31,092 | 32,074 | 34,315
Income from Discontinued Operation |  |  |  |  | 0 | 3 | 0 | 0 | 0 | 3 | 74
Net Income Attributable to Kadant | $ 760 | $ 13,285 | $ 8,096 | $ 8,951 | $ 7,733 | $ 9,157 | $ 8,311 | $ 6,876 | $ 31,092 | $ 32,077 | $ 34,389
Basic Earnings per Share: |  |  |  |  |  |  |  |  |  |  |
Continuing Operations (in dollars per share) |  |  |  |  | $ 0.71 | $ 0.84 | $ 0.76 | $ 0.64 | $ 2.83 | $ 2.95 | $ 3.16
Net Income Attributable to Kadant (in dollars per share) | $ 0.07 | $ 1.21 | $ 0.74 | $ 0.82 | 0.71 | 0.84 | 0.76 | 0.64 | 2.83 | 2.95 | 3.16
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Continuing Operations (in dollars per share) |  |  |  |  | 0.69 | 0.82 | 0.75 | 0.62 | 2.75 | 2.88 | 3.09
Net Income Attributable to Kadant (in dollars per share) | 0.07 | 1.17 | 0.72 | 0.80 | 0.69 | 0.82 | 0.75 | 0.62 | 2.75 | 2.88 | 3.10
Cash Dividends Declared per Common Share (in dollars per share) | $ 0.21 | $ 0.21 | $ 0.21 | $ 0.21 | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.84 | $ 0.76 | $ 0.68

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