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Discontinued Operations - Discontinued Operations (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Aug. 17, 2015 | Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Assets held for sale |  | $ 0 | $ 4,840,000 |
Discontinued Operations, Disposed of by Sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Other income |  |  | 0 | $ 7,500,000
Gain on sale |  |  | 0 | $ 18,022,000
Discontinued Operations, Disposed of by Sale | Automotive Business |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain on sale |  |  | 18,000,000.0 |
Discontinued Operations, Disposed of by Sale | Consulting Agreement |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Non-design advisory services period | 2 years |  |  |
Discontinued Operations, Disposed of by Sale | Consulting Agreement | Maximum |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash consideration on sale of business | $ 15,000,000.0 |  |  |
Consulting Agreement |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Other income |  | $ 0 | 0 |
Equity Securities |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Minority investment (as a percent) |  | 20.00% |  |
Equity Securities | Compute |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Investments |  | $ 36,500,000 |  |
Minority investment (as a percent) |  | 20.00% |  |
Selling, general and administrative | Disposal Group, Not Discontinued Operations | Compute |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Transition services agreement reimbursements |  | $ 100,000 | $ 3,600,000 |

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