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Basis of Presentation and Principles of Consolidation - Narrative (Details) $ in Thousands				3 Months Ended		6 Months Ended
	Jul. 02, 2023 USD ($) shares	Aug. 17, 2022 USD ($)	Jul. 03, 2022 shares	Jul. 02, 2023 USD ($)	Jul. 03, 2022 USD ($)	Jul. 02, 2023 USD ($) segment	Jul. 03, 2022 USD ($)	Jan. 01, 2023 USD ($)
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Net loss attributable to SkyWater Technology, Inc.				$ (8,590)	$ (13,005)	$ (12,863)	$ (29,611)
Cash and cash equivalents	$ 16,178			$ 16,178		$ 16,178		$ 30,025
Number of operating segments | segment						1
Restricted Stock Units and Stock Options
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Units excluded from computation (in shares) | shares	2,483,000		2,526,000
Funding to Meet Obligations as they Become Due | Oxbow
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Funding agreement with related party (up to)		$ 12,500

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