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Geographic and Significant Customer Information - Summary of Customer Concentrations as Percentage of Total Sales and Accounts Receivable (Detail) - Customer Concentration Risk	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Total Sales
Segment Reporting Information [Line Items]
Concentration risk, percentage	54.00%	57.00%	52.00%
Total Sales | Customer A
Segment Reporting Information [Line Items]
Concentration risk, percentage	16.00%	13.00%	11.00%
Total Sales | Customer B
Segment Reporting Information [Line Items]
Concentration risk, percentage	7.00%	6.00%	10.00%
Accounts Receivable | Customer A
Segment Reporting Information [Line Items]
Concentration risk, percentage	24.00%	19.00%
Accounts Receivable | Customer C
Segment Reporting Information [Line Items]
Concentration risk, percentage	10.00%	26.00%

X

- Definition

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.

+ References

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
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611

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

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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