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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 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