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Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Income	$ 61,046	$ 31,583	$ 32,469
Other Comprehensive Items:
Foreign currency translation adjustment	(17,381)	23,847	(13,240)
Pension and other post-retirement liability adjustments, net (net of tax of $412, $(150), and $125)	1,248	(738)	256
Effect of pension and other post-retirement plan amendments (net of tax of $351)	(1,087)	0	0
Effect of pension and other post-retirement plan curtailments (net of tax of $1,183)	3,679	0	0
Pension and other post-retirement curtailment loss (net of tax of $347)	1,078	0	0
Deferred (loss) gain on cash flow hedges (net of tax of $(93), $39, and $(67))	(276)	67	241
Other Comprehensive Items	(12,739)	23,176	(12,743)
Comprehensive Income	48,307	54,759	19,726
Comprehensive Income Attributable to Noncontrolling Interest	(555)	(745)	(314)
Comprehensive Income Attributable to Kadant	$ 47,752	$ 54,014	$ 19,412

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