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Acquisitions - Summary of Revenue and Earnings (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
Business Acquisition [Line Items]
Loss from discontinued operations	$ (378)	$ (220)	$ (18)	$ (5,599)	$ 0	$ (6,215)	$ (19,077)
Applied Micro Circuits Corporation
Business Acquisition [Line Items]
Revenue							110,117
Income (loss) before income taxes							(27,222)
Loss from discontinued operations							$ (44,599)

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