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

Segment Information (Schedule Of Long-Lived Assets By Geographic Region) (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 158,780	$ 176,251
Assets	554,463	519,269
Greater China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	92,062	98,641
Assets	301,498	289,463
Southeast Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	13,042	14,603
Assets	45,495	49,444
North Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	3,311	1,908
Assets	14,186	13,234
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	108,415	115,152
Assets	361,179	352,141
Americas And Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	50,365	61,099
Assets	$ 193,284	$ 167,128