v3.26.1
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
Jul. 04, 2026
Jun. 28, 2025
Jul. 04, 2026
Jun. 28, 2025
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net earnings attributable to USANA $ (21,382) $ 9,655 $ (13,867) $ 19,057
Weighted average common shares outstanding - basic (in shares) 18,486 18,513 18,442 18,781
Dilutive effect of in-the-money equity awards (in shares) 0 23 0 30
Weighted average common shares outstanding - diluted (in shares) 18,486 18,536 18,442 18,811
(Loss) earnings per common share from net (loss) earnings attributable to USANA:        
Basic (in dollars per share) $ (1.16) $ 0.52 $ (0.75) $ 1.01
Diluted (in dollars per share) $ (1.16) $ 0.52 $ (0.75) $ 1.01
Equity awards excluded as the impact was anti-dilutive (in shares) 6   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) 1,169 396 1,097 431