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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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