Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measures (Narrative) (Details)

v2.4.1.9
Fair Value Measures (Narrative) (Details) (USD $)
Apr. 04, 2015
Jan. 03, 2015
Fair Value Measures [Abstract]    
Transfers of financial assets or liabilities $ 0usna_FairValueAssetsAndLiabilitiesLevel1BetweenLevel2TransfersAmount $ 0usna_FairValueAssetsAndLiabilitiesLevel1BetweenLevel2TransfersAmount
Non-financial assets $ 0usna_NonfinancialAssetsFairValueDisclosure $ 0usna_NonfinancialAssetsFairValueDisclosure