Variable Interest Entities - Summary of Condensed Income Statements (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Condensed Income Statements, Captions [Line Items]
Interest expense	$ 1,029	$ 1,058
Net loss attributable to SkyWater Technology, Inc.	(16,606)	(2,811)
VIEs
Condensed Income Statements, Captions [Line Items]
Revenue	1,260	1,345
General and administrative expenses	77	252
Interest expense	324	335
Total expenses	401	587
Net loss attributable to SkyWater Technology, Inc.	$ 859	$ 758