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Fresh Start Accounting - Cumulative Impact of Reorganization Adjustments (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 29, 2025	Sep. 29, 2025	Jun. 28, 2026	Jun. 29, 2025	Jun. 30, 2024
Reorganization, Chapter 11 [Line Items]
Write-off related to directors' and officers' insurance policy		$ (3.6)	$ 0.0	$ 0.0	$ 0.0
Cancellation of unvested Predecessor stock compensation awards		(61.5)	0.0	0.0	$ 0.0
Obligation to issue Contingent Shares to existing equity holders (direct charge to equity)	$ 19.2	19.2
Net change in accumulated deficit	0.0	0.0	$ (415.8)	$ (4,537.6)
Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Gain on settlement of liabilities subject to compromise	3,751.8
Success fees	(33.9)
Write-off related to directors' and officers' insurance policy	(3.6)
Cancellation of unvested Predecessor stock compensation awards	(61.5)
Total reorganization adjustments impacting reorganization items, net	3,652.8	3,652.8
Cancellation of Old Common Stock and additional paid-in capital (direct charge to equity)	4,165.3	4,165.3
Obligation to issue Contingent Shares to existing equity holders (direct charge to equity)	(19.2)	(19.2)
Net deferred tax impacts (classified as tax expense)	(2.5)	(2.5)
Net change in accumulated deficit	7,767.6	$ 7,767.6
Reorganization Adjustments \| Additional Paid-in Capital
Reorganization, Chapter 11 [Line Items]
Issuance of New Common Stock and additional paid-in capital to existing equity holders (direct charge to equity)	$ (28.8)