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Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Other Current Assets (Details) $ in Millions	Jun. 28, 2026 USD ($)	Sep. 29, 2025 USD ($)	Jun. 29, 2025 USD ($) property	Mar. 30, 2025 property	Jun. 30, 2024 USD ($)
Supply Commitment [Line Items]
Short-term spares	$ 20.9		$ 0.0
Insurance deposit	5.3		7.4
Accrued interest receivable	4.8		5.4
Assets held for sale	1.7		24.4
VAT receivables	0.7		9.1
Reimbursement receivable on long-term incentive agreement	0.5		33.1
MACOM shares	0.0		102.0
Other	11.3		19.5
Other current assets	45.2	$ 119.9	$ 222.0
Disposal Group, Held-for-Sale, Not Discontinued Operations
Supply Commitment [Line Items]
Number of properties held-for-sale \| property				3
Discontinued Operations, Disposed of by Sale
Supply Commitment [Line Items]
Number of properties held-for-sale \| property			2
RF Business Master Supply Agreement
Supply Commitment [Line Items]
Inventory related to the RF Master Supply Agreement	0.0		$ 15.8
Receivable on RF Master Supply Agreement	$ 0.0		5.3
Other current assets			$ 0.0		$ 5.3