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Summary of Significant Accounting Policies (Freight Expenses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |
Cost of sales | $ 1,413,185 | $ 1,422,857 | $ 1,391,894
Freight expense |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of sales | $ 123,667 | $ 134,190 | $ 119,096

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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