COMMON STOCK AND EARNINGS PER SHARE - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2025	Jun. 29, 2024	Jun. 28, 2025	Jun. 29, 2024
Earnings Per Share [Abstract]
Net earnings attributable to USANA	$ 9,655	$ 10,432	$ 19,057	$ 26,969
Weighted average common shares outstanding - basic (in shares)	18,513	19,073	18,781	19,123
Dilutive effect of in-the-money equity awards (in shares)	23	86	30	107
Weighted average common shares outstanding - diluted (in shares)	18,536	19,159	18,811	19,230
Earnings per common share from net earnings attributable to USANA:
Basic (in dollars per share)	$ 0.52	$ 0.55	$ 1.01	$ 1.41
Diluted (in dollars per share)	$ 0.52	$ 0.54	$ 1.01	$ 1.40
Equity awards excluded as the impact was anti-dilutive (in shares)	396	696	431	541

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

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

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