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Unaudited Quarterly Information - Summary of Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 182,659	$ 173,504	$ 177,165	$ 171,316	$ 163,935	$ 165,745	$ 154,913	$ 149,193	$ 704,644	$ 633,786	$ 515,033
Gross Profit	74,627	74,247	74,371	70,515	70,945	73,093	68,164	66,079
Amounts Attributable to Kadant:
Net Income Attributable to Kadant	$ 8,749	$ 16,115	$ 16,304	$ 10,900	$ 18,422	$ 18,784	$ 12,349	$ 10,858	$ 52,068	$ 60,413	$ 31,092
Earnings per Share Attributable to Kadant
Net Income Attributable to Kadant (in dollars per share)	$ 0.77	$ 1.43	$ 1.46	$ 0.98	$ 1.66	$ 1.69	$ 1.11	$ 0.98	$ 4.63	$ 5.45	$ 2.83
Net Income Attributable to Kadant (in dollars per share)	0.76	1.41	1.42	0.96	1.61	1.64	1.08	0.96	4.54	5.30	2.75
Cash Dividends Declared per Common Share (in dollars per share)	$ 0.23	$ 0.23	$ 0.23	$ 0.23	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.92	$ 0.88	$ 0.84

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