USANA Health Sciences, Inc. Quarterly report pursuant to Section 13 or 15(d)

Name:	us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Unrecognized cost of unvested share-based compensation awards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not Yet Recognized, Next Twelve Months

No definition available.

Name:	usna_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedNextTwelveMonths
Namespace Prefix:	usna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not Yet Recognized, Year Five

No definition available.

Name:	usna_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedYearFive
Namespace Prefix:	usna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not Yet Recognized, Year Four

No definition available.

Name:	usna_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedYearFour
Namespace Prefix:	usna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not Yet Recognized, Year Three

No definition available.

Name:	usna_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedYearThree
Namespace Prefix:	usna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not Yet Recognized, Year Two

No definition available.