Segment Information (Schedule Of Revenue Percentage By Product) (Details)

v2.4.0.6

Segment Information (Schedule Of Revenue Percentage By Product) (Details)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
USANA Nutritionals [Member]
Revenue from External Customer [Line Items]
Percentage of product revenue	80.00%	79.00%	77.00%
USANA Foods [Member]
Revenue from External Customer [Line Items]
Percentage of product revenue	11.00%	11.00%	12.00%
Sense - Beautiful Science [Member]
Revenue from External Customer [Line Items]
Percentage of product revenue	7.00%	7.00%	8.00%