For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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-Subparagraph (a)
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Business Segment Data - Narrative (Detail) - segment	12 Months Ended
Business Segment Data - Narrative (Detail) - segment	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
Segment Reporting Information [Line Items]
Number of reportable segments	2
Property, Plant and Equipment \| Costa Rica
Segment Reporting Information [Line Items]
Percentage of net sales	35.00%
Geographic Concentration Risk \| Net sales \| Walmart
Segment Reporting Information [Line Items]
Percentage of net sales	9.00%	10.00%	9.00%
Geographic Concentration Risk \| Net sales \| Top Ten Customers
Segment Reporting Information [Line Items]
Percentage of net sales	30.00%	32.00%	31.00%
Geographic Concentration Risk \| Net sales \| United States
Segment Reporting Information [Line Items]
Percentage of net sales	65.00%	64.00%	58.00%