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Earnings per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Amounts Attributable to Kadant [Abstract]
Income from Continuing Operations	$ 5,935	$ 6,461	$ 5,772	$ 5,313	$ 9,603	$ 7,617	$ 6,546	$ 7,114	$ 23,481	$ 30,880	$ 33,584
(Loss) Income from Discontinued Operation									(62)	743	(9)
Net Income	$ 5,928	$ 6,447	$ 5,760	$ 5,284	$ 9,566	$ 8,461	$ 6,543	$ 7,053	$ 23,419	$ 31,623	$ 33,575
Basic Weighted Average Shares (in shares)									11,153,000	11,456,000	12,124,000
Effect of Stock Options, Restricted Stock Units and Employee Stock Purchase Plan (in shares)									187,000	134,000	137,000
Diluted Weighted Average Shares (in shares)									11,340,000	11,590,000	12,261,000
Basic Earnings Per Share [Abstract]
Continuing Operations (in dollars per share)	$ 0.53	$ 0.58	$ 0.52	$ 0.48	$ 0.85	$ 0.67	$ 0.57	$ 0.61	$ 2.11	$ 2.70	$ 2.77
Discontinued operation (in dollars per share)									$ (0.01)	$ 0.06	$ 0
Net Income per Basic Share (in dollars per share)	$ 0.53	$ 0.58	$ 0.52	$ 0.47	$ 0.85	$ 0.75	$ 0.57	$ 0.61	$ 2.10	$ 2.76	$ 2.77
Diluted Earnings Per Share [Abstract]
Continuing operations (in dollars per share)	$ 0.52	$ 0.57	$ 0.51	$ 0.47	$ 0.84	$ 0.66	$ 0.56	$ 0.61	$ 2.07	$ 2.66	$ 2.74
Discontinued operation (in dollars per share)									$ (0.01)	$ 0.06	$ 0
Net Income per Diluted Share (in dollars per share)	$ 0.52	$ 0.57	$ 0.51	$ 0.47	$ 0.83	$ 0.74	$ 0.56	$ 0.60	$ 2.07	$ 2.73	$ 2.74
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)									74,300	150,000	67,500
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)									20,400	28,500	45,700

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