Annual report pursuant to Section 13 and 15(d)

Long-Term Debt And Line Of Credit (Details)

v2.4.1.9
Long-Term Debt And Line Of Credit (Details) (USD $)
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Long-Term Debt And Line Of Credit [Abstract]    
Credit Facility $ 75,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Reduction in available borrowing limit 4,575,000usna_LineOfCreditFacilityIncreaseDecreaseInBorrowingCapacity 3,800,000usna_LineOfCreditFacilityIncreaseDecreaseInBorrowingCapacity
Outstanding debt $ 0us-gaap_LineOfCreditFacilityAmountOutstanding $ 0us-gaap_LineOfCreditFacilityAmountOutstanding
Line of credit facility, maturity date 2016-04