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, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	$ 153,724us-gaap_NoncurrentAssets	$ 133,906us-gaap_NoncurrentAssets
Assets	350,584us-gaap_Assets	368,470us-gaap_Assets
North America/Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	54,457	52,908
Assets	152,405	183,561
Southeast Asia/Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	14,175	15,868
Assets	38,404	36,349
Greater China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	83,471	63,505
Assets	154,153	141,542
North Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	1,621	1,625
Assets	5,622	7,018
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	99,267	80,998
Assets	$ 198,179	$ 184,909