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
Sep. 27, 2025
Sep. 28, 2024
Sep. 27, 2025
Sep. 28, 2024
Earnings Per Share [Abstract]        
Net earnings attributable to USANA $ (6,522) $ 10,607 $ 12,535 $ 37,576
Weighted average common shares outstanding - basic (in shares) 18,293 19,078 18,618 19,108
Dilutive effect of in-the-money equity awards (in shares) 0 5 53 73
Weighted average common shares outstanding - diluted (in shares) 18,293 19,083 18,671 19,181
(Loss) earnings per common share from net (loss) earnings attributable to USANA:        
Basic (in dollars per share) $ (0.36) $ 0.56 $ 0.67 $ 1.97
Diluted (in dollars per share) $ (0.36) $ 0.56 $ 0.67 $ 1.96
Equity awards excluded as the impact was anti-dilutive (in shares) 368 628 410 570