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Summary Of Significant Accounting Policies (Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 28, 2019 USD ($) item | Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($) | Feb. 05, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Geographical regions | item | 2 |  |  |
Sub-geographical regions | item | 3 |  |  |
Transfers between levels | $ 0 | $ 0 |  |
Non-financial assets | 0 |  |  |
Receivable from credit card processors | 12,619,000 | 11,860,000 |  |
Impairment |  |  | $ 2,734,000 |
Other-than-temporary impairments | $ 0 |  |  |
Maturity date | Feb. 01, 2024 |  |  |
Notes receivable |  |  | 6,734,000 |
Goodwill impairment | $ 0 | 0 | 0 |
Impairment of indefinite-lived intangible assets | 0 | 0 | 0 |
Amount of individual claims before reimbursement | 150,000 |  |  |
Minimum amount of aggregate claims before reimbursement | 10,464,000 |  |  |
Self insurance program expense | 11,846,000 | $ 10,869,000 | $ 9,195,000 |
Amount available to repurchase under the stock repurchase plan | $ 30,000,000 |  |  |
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% | 0.70% |
Advertising expense | $ 11,615,000 | $ 10,345,000 | $ 11,503,000 |
Research and development expense | 10,259,000 | 10,242,000 | 8,952,000 |
Derivative outstanding | 0 | 0 |  |
Notional amount | 110,000,000 | 105,000,000 |  |
Derivative gain | 276,000 | 739,000 |  |
Loans recovered |  | 4,800,000 |  |
Contract assets | 0 | 0 |  |
Operating, right-of-use | 31,263,000 |  |  |
Restricted cash | 2,858,000 | $ 2,908,000 | $ 3,076,000 |
Penalty | 0 |  |  |
Right-of-use assets obtained in exchange for new lease obligations | 13,575,000 |  |  |
Current operating lease liabilities | 8,323,000 |  |  |
Non-current operating lease liabilities | 17,274,000 |  |  |
Prepaid land use rights related to production facilities | $ 6,853,000 |  |  |
LIBOR [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Basis point | 4.00% |  |  |
Buildings [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Lease expiration date | 2026 |  |  |
Laboratory And Production Equipment [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Lease expiration date | 2022 |  |  |
Subsequent Event [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Remaining approved repurchase amount |  |  |  | $ 130,000,000
Accounting Standards Update 2018-11 [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Operating, right-of-use | $ 19,671,000 |  |  |
Right-of-use assets obtained in exchange for new lease obligations | 20,010,000 |  |  |
Current operating lease liabilities | 7,120,000 |  |  |
Non-current operating lease liabilities | $ 12,890,000 |  |  |

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