Acquired Intangibles - Summary of Life, Gross Carrying Value of Acquired Intangible Assets, and Related Accumulated Amortization (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 26, 2021	Jun. 27, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 544.7	$ 398.3
Accumulated Amortization	(243.2)	(304.9)
Net Carrying Value	$ 301.5	93.4
Weighted Average Life in Years	5 years 1 month 6 days
Audio and Video Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 138.6	138.6
Accumulated Amortization	(97.6)	(76.5)
Net Carrying Value	$ 41.0	62.1
Weighted Average Life in Years	5 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 125.5	81.8
Accumulated Amortization	(63.8)	(61.4)
Net Carrying Value	$ 61.7	20.4
Weighted Average Life in Years	4 years 2 months 12 days
Wireless and Connectivity Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 93.0
Accumulated Amortization	(14.2)
Net Carrying Value	$ 78.8
Weighted Average Life in Years	6 years
Video Interface Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 82.0
Accumulated Amortization	(25.1)
Net Carrying Value	$ 56.9
Weighted Average Life in Years	3 years
Display Driver Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 20.4	164.0
Accumulated Amortization	(17.5)	(158.2)
Net Carrying Value	$ 2.9	5.8
Weighted Average Life in Years	7 years
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 12.0
Accumulated Amortization	(12.0)
Licensed Technology and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	13.0	7.7
Accumulated Amortization	(8.1)	(5.5)
Net Carrying Value	$ 4.9	2.2
Weighted Average Life in Years	4 years 1 month 6 days
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 4.4	4.4
Accumulated Amortization	(3.2)	(2.6)
Net Carrying Value	$ 1.2	1.8
Weighted Average Life in Years	8 years
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 4.8	1.8
Accumulated Amortization	(1.7)	(0.7)
Net Carrying Value	$ 3.1	$ 1.1
Weighted Average Life in Years	5 years 1 month 6 days
In-Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 51.0
Net Carrying Value	$ 51.0