XML 44 R33.htm IDEA: XBRL DOCUMENT v3.10.0.1

Derivative Financial Instruments (Narrative) (Details) - USD ($)	3 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Derivative Financial Instruments [Abstract]
Derivative outstanding	$ 0	$ 0
Notional amount	105,000,000
Derivative gain	$ 739,000

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Derivative Instrument, Gain Recognized in Other

+ References

No definition available.

+ Details

Name:	usna_DerivativeInstrumentGainRecognizedInOther
Namespace Prefix:	usna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration