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Inventories - Narrative (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018 | Dec. 29, 2018
Geographic Valuation Methodologies Of Inventory [Line Items] |  |  |  |  |
Percentage of FIFO Inventory | 60.00% |  | 60.00% |  | 61.00%
Effect of LIFO inventory liquidation on income | $ 0 | $ 0 | $ 0 | $ 0 |
United States |  |  |  |  |
Geographic Valuation Methodologies Of Inventory [Line Items] |  |  |  |  |
Percentage of FIFO Inventory | 34.00% |  | 34.00% |  |
Percentage of LIFO Inventory | 66.00% |  | 66.00% |  |

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- Definition The effect of liquidating LIFO (last in first out) inventory layers on income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SAB Topic 11.F) -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100079-122729 + Details
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