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Inventories - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 30, 2017
Geographic Valuation Methodologies Of Inventory [Line Items]
Percentage of FIFO Inventory	61.00%		61.00%		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	35.00%		35.00%
Percentage of LIFO Inventory	65.00%		65.00%

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- Definition

Geographic Valuation Methodologies of Inventory [Line Items]

+ References

No definition available.

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The effect of liquidating LIFO (last in first out) inventory layers on income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6)(c))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Topic 330
-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100079-122729

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section S50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6386917&loc=d3e99609-122727

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The percentage of FIFO (first in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

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The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

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