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Summary Of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, shares in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2017 USD ($) $ / shares | Sep. 30, 2017 USD ($) $ / shares | Jul. 01, 2017 USD ($) $ / shares | Apr. 01, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares | Oct. 01, 2016 USD ($) $ / shares | Jul. 02, 2016 USD ($) $ / shares | Apr. 02, 2016 USD ($) $ / shares | Dec. 30, 2017 USD ($) item $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Jan. 02, 2016 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 | 11,517,000 |  |  |  | 11,659,000 |  |  |  | 11,517,000 | 11,659,000 |
Restricted cash | 3,076,000 |  |  |  | 2,880,000 |  |  |  | 3,076,000 | 2,880,000 |
Impairment |  |  |  |  |  |  |  |  | $ 2,734,000 |  |
Maturity date |  |  |  |  |  |  |  |  | Feb. 01, 2024 |  |
Credits on notes receivable |  |  |  |  |  |  |  |  | $ 86,000 | 1,288,000 | 966,000
Notes receivable | 6,734,000 |  |  |  | 6,867,000 |  |  |  | 6,734,000 | 6,867,000 |
Goodwill impairment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment of indefinite-lived intangible assets |  |  |  |  |  |  |  |  | 0 | 0 | 0
Amount of individual claims before reimbursement |  |  |  |  |  |  |  |  | 125,000 |  |
Minimum amount of aggregate claims before reimbursement |  |  |  |  |  |  |  |  | 9,441,000 |  |
Self insurance program expense |  |  |  |  |  |  |  |  | 9,195,000 | $ 9,015,000 | 7,287,000
Tax benefit from equity award activity |  |  |  |  |  |  |  |  |  |  | $ 12,024,000
Amount available to repurchase under the stock repurchase plan | 50,000,000 |  |  |  |  |  |  |  | $ 50,000,000 |  |
Common stock repurchased and retired, shares | shares |  |  |  |  |  |  |  |  | 865 | 1,106 | 914
Repurchase of common stock |  |  |  |  |  |  |  |  | $ 50,000,000 | $ 64,610,000 | $ 61,181,000
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% | 0.70% | 0.60%
Advertising expense |  |  |  |  |  |  |  |  | $ 11,503,000 | $ 12,266,000 | $ 13,766,000
Research and development expense |  |  |  |  |  |  |  |  | 8,952,000 | 8,842,000 | 6,420,000
Tax benefit recorded in income tax expense |  |  |  |  |  |  |  |  | 4,614,000 | 9,140,000 |
Net earnings | $ (5,851,000) | $ 23,769,000 | $ 23,259,000 | $ 21,358,000 | $ 21,882,000 | $ 30,098,000 | $ 25,762,000 | $ 22,299,000 | $ 62,535,000 | $ 100,041,000 | $ 94,672,000
Diluted | $ / shares | $ (0.24) | $ 0.97 | $ 0.93 | $ 0.86 | $ 0.87 | $ 1.20 | $ 1.03 | $ 0.89 | $ 2.53 | $ 3.99 | $ 3.59
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax benefit from equity award activity |  |  |  |  |  |  |  |  |  |  | $ 12,024,000
Manufacturing Credits [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credits on notes receivable |  |  |  |  |  |  |  |  | $ 420,000 | $ 1,860,000 |
Scenario, Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cummulative-effect of accounting change |  |  |  |  |  |  |  |  |  |  | 333,000
Scenario, Adjustment [Member] | Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cummulative-effect of accounting change |  |  |  |  |  |  |  |  |  |  | $ 934,000
LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis point |  |  |  |  |  |  |  |  | 4.00% |  |

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