Basis of Presentation and Principles of Consolidation - Schedule of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 29, 2024	Dec. 31, 2023	Jan. 01, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Numerator: Net loss attributable to SkyWater Technology, Inc.	$ (6,793)	$ (30,756)	$ (39,593)
Denominator: Weighted-average common shares outstanding, basic (in shares)	47,396	45,507	40,835
Denominator: Weighted-average common shares outstanding, diluted (in shares)	47,396	45,507	40,835
Net loss per common share, basic (in USD per share)	$ (0.14)	$ (0.68)	$ (0.97)
Net loss per common share, diluted (in USD per share)	$ (0.14)	$ (0.68)	$ (0.97)

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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