Quarterly report pursuant to Section 13 or 15(d)

Equity-Based Compensation (Schedule Of Remaining Unrecognized Compensation Expense For Unvested Awards) (Details)

v2.4.1.9
Equity-Based Compensation (Schedule Of Remaining Unrecognized Compensation Expense For Unvested Awards) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Apr. 04, 2015
Equity-Based Compensation [Abstract]  
2015 $ 5,664usna_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedNextTwelveMonths
2016 6,771usna_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedYearTwo
2017 4,484usna_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedYearThree
2018 1,561usna_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedYearFour
2019+ 510usna_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedYearFive
Total $ 18,990us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Unrecognized compensation expense weighted average period of recognition 1 year 10 months 24 days