Stock-Based Compensation - Schedule of Total Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 29, 2025	Jun. 28, 2026	Jun. 29, 2025	Jun. 30, 2024
Employee Service share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 13.6	$ 27.1	$ 73.3	$ 84.9
Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold
Employee Service share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	7.8	10.7	36.9	28.5
Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpense
Employee Service share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	2.2	2.7	11.6	11.4
Income Statement Location [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense
Employee Service share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 3.6	$ 13.7	$ 24.8	$ 45.0