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Discontinued Operations - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended		24 Months Ended
	Sep. 29, 2025	Jun. 28, 2026	Jun. 29, 2025	Jun. 30, 2024	Jun. 30, 2024	Sep. 08, 2025	Jul. 25, 2025	Dec. 02, 2023
Disposal Group, Including Discontinued Operations [Line Items]
Other current liabilities	$ 59.8	$ 51.1	$ 220.5
Other current assets	119.9	45.2	222.0
Restructuring and related cost, facility transfer period threshold								2 years
Gain (loss) on disposition of business	25.4	0.0	0.0	$ 0.0
RF Business Master Supply Agreement
Disposal Group, Including Discontinued Operations [Line Items]
Other current liabilities			0.0	25.4	$ 25.4			$ 95.0
Other current assets			0.0	5.3	5.3
Discontinued Operations, Disposed of by Sale \| RF Business
Disposal Group, Including Discontinued Operations [Line Items]
Aggregate net proceeds from sale of business unit								$ 75.0
Disposal group, including discontinued operation, consideration, equity interest issued or issuable (in shares)								711,528
Loss on sale				204.0
Cost of selling business				12.2	$ 25.4
Gain (loss) on disposition of business	25.4
Discontinued Operations, Disposed of by Sale \| Long-term Epi Supply Agreement
Disposal Group, Including Discontinued Operations [Line Items]
Disposal group, including discontinued operation, liabilities	72.4	59.6	58.0				$ 58.0
Discontinued Operations, Disposed of by Sale \| LED Business
Disposal Group, Including Discontinued Operations [Line Items]
Gain (loss) on disposition of business	$ 0.0	$ 0.0	$ (9.2)	$ (25.3)
Discontinued Operations, Disposed of by Sale \| RF Business, Consideration, Equity Interest Issued Or Issuable
Disposal Group, Including Discontinued Operations [Line Items]
Shares forfeited if transfer doesn't occur								25.00%
Discontinued Operations, Disposed of by Sale \| MACOM Shares
Disposal Group, Including Discontinued Operations [Line Items]
Aggregate net proceeds from sale of business unit						$ 91.1
Restricted cash and cash equivalent						$ 30.3