XML 64 R28.htm IDEA: XBRL DOCUMENT
v3.19.3

Operating Leases (Narrative) (Details) | 9 Months Ended
--- | ---
Sep. 28, 2019
Buildings [Member] |
Lease expiration date | 2026
Equipment [Member] |
Lease expiration date | 2022

X
- Definition Year which lease or group of leases is set to expire, in CCYY format. + References No definition available. + Details
Name: | usna_LeaseExpirationYear
Namespace Prefix: | usna_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |