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

Annual report pursuant to Section 13 and 15(d)

Summary Of Significant Accounting Policies (Narrative) (Details)

Summary Of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, shares in Thousands			3 Months Ended								12 Months Ended
	Nov. 22, 2016	Oct. 25, 2016	Dec. 31, 2016 USD ($) $ / shares	Oct. 01, 2016 USD ($) $ / shares	Jul. 02, 2016 USD ($) $ / shares	Apr. 02, 2016 USD ($) $ / shares	Jan. 02, 2016 USD ($) $ / shares	Oct. 03, 2015 USD ($) $ / shares	Jul. 04, 2015 USD ($) $ / shares	Apr. 04, 2015 USD ($) $ / shares	Dec. 31, 2016 USD ($) item $ / shares shares	Jan. 02, 2016 USD ($) $ / shares shares	Jan. 03, 2015 USD ($) $ / shares shares
Summary Of Significant Accounting Policies [Line Items]
Sub-geographical regions \| item											3
Transfers of financial assets or liabilities			$ 0				$ 0				$ 0	$ 0
Non-financial assets			0				0				0	0	$ 0
Receivable from credit card processors			11,659,000				12,516,000				11,659,000	12,516,000
Restricted cash			2,880,000				3,080,000				$ 2,880,000	3,080,000
Maturity date											Feb. 01, 2024
Credits on notes receivable											$ 1,288,000	966,000	720,000
Notes receivable			6,867,000				8,339,000				6,867,000	8,339,000
Goodwill impairment											0	0	0
Impairment of indefinite-lived intangible assets											0	0	0
Amount of individual claims before reimbursement											$ 125,000
Minimum percentage of projected aggregate claims before insurance reimbursement											100.00%
Self insurance program expense											$ 9,015,000	7,287,000	7,019,000
Proceeds from Stock Options Exercised													10,970,000
Tax benefit from equity award activity												$ 12,024,000	$ 14,712,000
Amount available to repurchase under the stock repurchase plan			35,390,000								$ 35,390,000
Common stock repurchased and retired, shares \| shares											1,106	914	3,854
Repurchase of common stock											$ 64,610,000	$ 61,181,000	$ 138,819,000
Account renewal fee period											12 months
Duration of product return for first order											30 days
Percentage of sale refunded											100.00%
Duration of product return											1 year
Amount of returned product which could result in cancellation of distributorship											$ 100
Product return percentage of net sales											0.70%	0.60%	0.80%
Advertising expense											$ 12,266,000	$ 13,766,000	$ 4,942,000
Research and development expense											8,842,000	6,420,000	5,128,000
Stock split ratio	2	2
Tax benefit recorded in income tax expense											9,140,000
Net earnings			$ 21,882,000	$ 30,098,000	$ 25,762,000	$ 22,299,000	$ 23,967,000	$ 25,609,000	$ 25,416,000	$ 19,680,000	$ 100,041,000	$ 94,672,000	$ 76,636,000
Diluted \| $ / shares			$ 0.87	$ 1.20	$ 1.03	$ 0.89	$ 0.92	$ 0.96	$ 0.96	$ 0.75	$ 3.99	$ 3.59	$ 2.80
Additional Paid-in Capital [Member]
Summary Of Significant Accounting Policies [Line Items]
Tax benefit from equity award activity												$ 12,024,000	$ 14,712,000
Adjustments for New Accounting Principle, Early Adoption [Member]
Summary Of Significant Accounting Policies [Line Items]
Net earnings											$ 8,600,000
Diluted \| $ / shares											$ 0.30
Manufacturing Credits [Member]
Summary Of Significant Accounting Policies [Line Items]
Credits on notes receivable											$ 1,860,000	966,000
Restatement Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Tax benefit recorded in income tax expense											(9,140,000)
Scenario, Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Cummulative-effect of accounting change			$ 333,000				$ 333,000				$ 333,000	333,000
Scenario, Adjustment [Member] \| Additional Paid-in Capital [Member]
Summary Of Significant Accounting Policies [Line Items]
Cummulative-effect of accounting change							$ 934,000					$ 934,000
LIBOR [Member]
Summary Of Significant Accounting Policies [Line Items]
Basis point											4.00%