Quarterly report [Sections 13 or 15(d)]

COMMON STOCK AND EARNINGS PER SHARE - Schedule of Earnings Per Share (Details)

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COMMON STOCK AND EARNINGS PER SHARE - Schedule of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 03, 2026
Sep. 27, 2025
Oct. 03, 2026
Sep. 27, 2025
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net (loss) earnings attributable to USANA $ (5,556) $ (6,522) $ (19,423) $ 12,535
Weighted average common shares outstanding - basic (in shares) 18,498 18,293 18,460 18,618
Dilutive effect of in-the-money equity awards (in shares) 0 0 0 53
Weighted average common shares outstanding - diluted (in shares) 18,498 18,293 18,460 18,671
(Loss) earnings per common share from net (loss) earnings attributable to USANA:        
Basic (in dollars per share) $ (0.30) $ (0.36) $ (1.05) $ 0.67
Diluted (in dollars per share) $ (0.30) $ (0.36) $ (1.05) $ 0.67
Equity awards excluded as the impact was anti-dilutive (in shares) 8 100 10  
Share-Based Payment Arrangement        
(Loss) earnings per common share from net (loss) earnings attributable to USANA:        
Equity awards excluded as the impact was anti-dilutive (in shares) 1,153 368 1,116 410