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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% |  |

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- Definition Minimum Percentage Of Projected Aggregate Claims Before Insurance Reimbursement + References No definition available. + Details
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- Definition Nonfinancial Assets Fair Value Disclosure + References No definition available. + Details
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- Definition Notes Receivable Maturity Date + References No definition available. + Details
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- Definition Number Of Sub Geographical Regions + References No definition available. + Details
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- Definition Product Return Percentage Of Net Sales + References No definition available. + Details
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- Definition Product Return Policy, Amount Of Returned Product Which Could Result In Cancellation Of Distributorship + References No definition available. + Details
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- Definition Product Return Policy, Percentage Refunded + References No definition available. + Details
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- Definition Summary Of Significant Accounting Policies [Line Items] + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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