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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
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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% |

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- 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 -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -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. + Details
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