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Discontinued Operations - Summary of Operating Results Through Dates of Divestiture Related to Divested Businesses (Detail) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Operating expenses:
Loss income from discontinued operations	$ (378)	$ (220)	$ (18)	$ (5,599)	$ 0	$ (6,215)	$ (19,077)
Cash flow from Investing Activities (2)					$ 0	4,737	25,520
Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue (1)						0	660
Cost of revenue (1)						(596)	2,252
Gross profit (loss)						596	(1,592)
Operating expenses:
Research and development (1)						5,251	29,167
Selling, general and administrative (1)						1,560	13,840
Total operating expenses						6,811	43,007
Loss from discontinued operations (1)						(6,215)	(44,599)
Other income (2)						0	7,500
Gain on sale (2)						0	18,022
Loss income before income taxes						(6,215)	(19,077)
Income tax provision (benefit)						0	0
Loss income from discontinued operations						(6,215)	(19,077)
Cash flow used in Operating Activities (1)						(10,734)	(42,776)
Cash flow from Investing Activities (2)						$ 0	$ 25,522

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