Condensed Consolidated Statement of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
Apr. 03, 2021	Mar. 28, 2020
Income Statement [Abstract]
Revenue (Notes 1 and 9)	$ 172,463	$ 159,127
Costs and Operating Expenses:
Cost of revenue	96,748	90,804
Selling, general, and administrative expenses	49,431	45,592
Research and development expenses	2,857	3,076
Total Costs and Operating Expenses	149,036	139,472
Operating Income	23,427	19,655
Interest Income	65	51
Interest Expense	(1,111)	(2,459)
Other Expense, Net	(24)	(32)
Income Before Provision for Income Taxes	22,357	17,215
Provision for Income Taxes (Note 3)	5,561	4,559
Net Income	16,796	12,656
Net Income Attributable to Noncontrolling Interest	(235)	(125)
Net Income Attributable to Kadant	$ 16,561	$ 12,531
Earnings per Share Attributable to Kadant (Note 2)
Basic (in dollars per share)	$ 1.43	$ 1.10
Diluted (in dollars per share)	$ 1.43	$ 1.09
Weighted Average Shares (Note 2)
Basic (in shares)	11,553	11,432
Diluted (in shares)	11,612	11,508

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227