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Derivative Financial Instruments (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 30, 2019	Dec. 29, 2018
Derivative Financial Instruments [Abstract]
Derivative outstanding		$ 0
Notional amount	$ 110,000,000
Derivative gain	$ 986,000

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

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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://fasb.org/us-gaap/role/ref/legacyRef
-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

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Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

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X

- Definition

Derivative Gain Loss Recognized In Accumulated Other Comprehensive Income

+ References

No definition available.

+ Details

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Namespace Prefix:	usna_
Data Type:	xbrli:monetaryItemType
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