XML 38 R27.htm IDEA: XBRL DOCUMENT v3.19.1

Operating Leases (Narrative) (Details)	3 Months Ended
	Mar. 30, 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: