Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions	Jun. 29, 2019	Jun. 30, 2018	Sep. 08, 2017	Jul. 25, 2017	Jun. 24, 2017
Business Acquisition [Line Items]
Goodwill	$ 372.8	$ 372.8			$ 206.8
Conexant Systems, LLC [Member]
Business Acquisition [Line Items]
Cash				$ 4.3
Accounts receivable				11.7
Inventory				51.0
Other current assets				3.5
Property and equipment				3.2
Acquired intangible assets				145.7
Other assets				0.9
Total identifiable assets acquired				220.3
Accounts payable				14.2
Accrued compensation				1.3
Other accrued liabilities				9.3
Other long-term liabilities				3.0
Net identifiable assets acquired				192.5
Goodwill				153.7
Net assets acquired				$ 346.2
Marvell Technology Group Ltd [Member]
Business Acquisition [Line Items]
Inventory			$ 28.4
Property and equipment			5.0
Acquired intangible assets			48.7
Total identifiable assets acquired			82.1
Accrued liabilities			0.7
Net identifiable assets acquired			81.4
Goodwill			12.3
Net assets acquired			$ 93.7