USANA Health Sciences, Inc. Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Commitments And Contingencies [Line Items]
Total rent expense	$ 6,452	$ 6,410	$ 4,442
Minimum employee age to partake in 401(k)	18 years
Requisite service period to partake in 401(k)	1 month
Employers' maximum contribution of employee's compensation	6.00%
Requisite service in order to cliff vest	2 years
Contributions made by the Company	$ 1,024	$ 979	$ 900
First Portion Match [Member]
Commitments And Contingencies [Line Items]
Employers' percentage match of employee's contribution percentage	100.00%
Percentage of employee's gross pay that is matched by the employer	1.00%
Second Portion Match [Member]
Commitments And Contingencies [Line Items]
Employers' percentage match of employee's contribution percentage	50.00%
Percentage of employee's gross pay that is matched by the employer	1.00%
Buildings [Member]
Commitments And Contingencies [Line Items]
Lease expiration date	2019
Equipment [Member]
Commitments And Contingencies [Line Items]
Lease expiration date	2016