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Fresh Start Accounting - Narrative (Details) - USD ($) shares in Thousands, $ in Millions	Sep. 29, 2025	Jun. 28, 2026	Jun. 29, 2025	Jun. 30, 2024	Jun. 25, 2023
Reorganization, Chapter 11 [Line Items]
Reorganization value	$ 3,838.1
Bankruptcy claims, post petition liabilities and allowed claims	7,600.0
Reorganization value, enterprise value	$ 2,600.0
Reorganization value, present value of discounted cash flows of emerging entity, discount rate	20.10%
Intangible assets, net	$ 445.7	$ 392.2	$ 23.8
Cash and cash equivalents (includes restricted cash)	481.0	576.3	467.2	$ 1,045.9	$ 1,757.0
Restricted cash	28.3
Accounts payable and accrued expenses	206.8	$ 118.5	$ 280.2
Common stock issued (shares)		52,162	155,643
Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Intangible assets, net	0.0
Cash and cash equivalents (includes restricted cash)	(90.6)
Accounts payable and accrued expenses	10.3
Accrued success fees, current	16.8
Payments for accrued lender professional fees	$ 6.5
Common stock issued (shares)	25,800
Technology-Based Intangible Assets \| Measurement Input, Discount Rate
Reorganization, Chapter 11 [Line Items]
Intangible assets (excluding goodwill), measurement input	0.21
Trademarks and Trade Names \| Measurement Input, Royalty Rate
Reorganization, Chapter 11 [Line Items]
Intangible assets (excluding goodwill), measurement input	0.005
Trademarks and Trade Names \| Measurement Input, Discount Rate
Reorganization, Chapter 11 [Line Items]
Intangible assets (excluding goodwill), measurement input	0.205
Customer-Related Intangible Assets \| Measurement Input, Discount Rate
Reorganization, Chapter 11 [Line Items]
Intangible assets (excluding goodwill), measurement input	0.225
Minimum
Reorganization, Chapter 11 [Line Items]
Reorganization value, enterprise value	$ 2,350.0
Incremental borrowing rate	0.099
Minimum \| Technology-Based Intangible Assets \| Measurement Input, Royalty Rate
Reorganization, Chapter 11 [Line Items]
Intangible assets (excluding goodwill), measurement input	0.05
Minimum \| Customer-Related Intangible Assets \| Measurement Input, Attrition Rate
Reorganization, Chapter 11 [Line Items]
Intangible assets (excluding goodwill), measurement input	0.10
Maximum
Reorganization, Chapter 11 [Line Items]
Reorganization value, enterprise value	$ 2,850.0
Incremental borrowing rate	0.139
Maximum \| Technology-Based Intangible Assets \| Measurement Input, Royalty Rate
Reorganization, Chapter 11 [Line Items]
Intangible assets (excluding goodwill), measurement input	0.15
Maximum \| Customer-Related Intangible Assets \| Measurement Input, Attrition Rate
Reorganization, Chapter 11 [Line Items]
Intangible assets (excluding goodwill), measurement input	0.175