Basis of Presentation and Principles of Consolidation - Schedule of Basic And Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Apr. 14, 2021	Apr. 03, 2022	Apr. 04, 2021
Numerator:
Net loss attributable to SkyWater Technology, Inc.		$ (16,606)	$ (2,811)
Undistributed preferred return to Class B preferred unitholders, basic		0	(359)
Undistributed preferred return to Class B preferred unitholders, diluted		0	(359)
Net loss attributable to common shareholders, basic		(16,606)	(3,170)
Net loss attributable to common shareholders, diluted		$ (16,606)	$ (3,170)
Denominator:
Weighted average shares outstanding, basic (in shares)		39,861,688	3,060,343
Weighted average shares outstanding, diluted (in shares)		39,861,688	3,060,343
Net loss per share, basic (in USD per share)		$ (0.42)	$ (1.04)
Net loss per share, diluted (in USD per share)		$ (0.42)	$ (1.04)
Common Units
Denominator:
Number of units converted (in shares)			2,105,936
Common Stock
Denominator:
Conversion of units (in shares)	31,055,743
Common Stock | Common Unit Holders
Denominator:
Conversion of units (in shares)	3,060,343		3,060,343