| Segment Information (Tables)
 | 9 Months Ended | 
| Sep. 28, 2024 | 
|---|
| Segment Reporting [Abstract] |  | 
| Schedule of Segment Reporting Information, by Segment | These operating segments are included as a component of “All other” and are included for purposes of reconciliation of net sales to the Company's Condensed Consolidated Statements of Comprehensive Income. 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  | Three Months Ended |  | Nine Months Ended |  
|  | September 28, 2024
 |  | September 30, 2023
 |  | September 28, 2024
 |  | September 30, 2023
 |  
| Net sales: |  |  |  |  |  |  |  |  
| Direct-selling | $ | 198,467 |  |  | $ | 211,932 |  |  | $ | 635,823 |  |  | $ | 695,607 |  |  
| All other | 1,754 |  |  | 1,433 |  |  | 5,067 |  |  | 4,320 |  |  
| Consolidated total | $ | 200,221 |  |  | $ | 213,365 |  |  | $ | 640,890 |  |  | $ | 699,927 |  |  | 
| Revenue from External Customers by Products and Services | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  | Three Months Ended |  | Nine Months Ended |  
|  | September 28, 2024
 |  | September 30, 2023
 |  | September 28, 2024
 |  | September 30, 2023
 |  
| USANA® Nutritionals | 86 | % |  | 86 | % |  | 87 | % |  | 87 | % |  
| 
USANA Foods(1)
 | 7 | % |  | 7 | % |  | 6 | % |  | 7 | % |  
| Personal care and Skincare | 6 | % |  | 6 | % |  | 6 | % |  | 5 | % |  
| All other | 1 | % |  | 1 | % |  | 1 | % |  | 1 | % | 
(1)Includes the Company’s Active Nutrition line.
 | 
| Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area | Financial information, presented by geographic region is listed below: 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  | Three Months Ended |  | Nine Months Ended |  
|  | September 28, 2024
 |  | September 30, 2023
 |  | September 28, 2024
 |  | September 30, 2023
 |  
| Net sales to external customers |  |  |  |  |  |  |  |  
| Asia Pacific |  |  |  |  |  |  |  |  
| Greater China | $ | 102,261 |  |  | $ | 106,609 |  |  | $ | 345,389 |  |  | $ | 359,178 |  |  
| Southeast Asia Pacific | 37,267 |  |  | 39,151 |  |  | 108,734 |  |  | 124,774 |  |  
| North Asia | 20,541 |  |  | 24,244 |  |  | 61,672 |  |  | 79,381 |  |  
| Asia Pacific total | 160,069 |  |  | 170,004 |  |  | 515,795 |  |  | 563,333 |  |  
| Americas and Europe | 40,152 |  |  | 43,361 |  |  | 125,095 |  |  | 136,594 |  |  
| Consolidated total | $ | 200,221 |  |  | $ | 213,365 |  |  | $ | 640,890 |  |  | $ | 699,927 |  |  | 
| Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas | The following table provides further information on markets representing ten percent or more of consolidated net sales and long-lived assets, respectively: 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  | Three Months Ended |  | Nine Months Ended |  
|  | September 28, 2024
 |  | September 30, 2023
 |  | September 28, 2024
 |  | September 30, 2023
 |  
| Net sales: |  |  |  |  |  |  |  |  
| China | $ | 91,278 |  |  | $ | 94,674 |  |  | $ | 312,147 |  |  | $ | 322,589 |  |  
| United States | 21,463 |  |  | 22,981 |  |  | 65,267 |  |  | 72,647 |  |  
| South Korea | 20,077 |  |  | 23,745 |  |  | 60,339 |  |  | 77,537 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  
|  | As of |  
|  | September 28, 2024
 |  | December 30, 2023
 |  
| Long-lived assets: |  |  |  |  
| United States | $ | 91,491 |  |  | $ | 93,181 |  |  
| China | 75,388 |  |  | 77,767 |  |  |