Fresh Start Accounting - Cumulative Impact of Fresh Start Adjustments (Details) - USD ($) $ in Millions	Jun. 28, 2026	Sep. 29, 2025	Jun. 29, 2025
Reorganization, Chapter 11 [Line Items]
Fresh start adjustment to Inventories, net	$ (234.2)	$ (392.3)	$ (435.4)
Fresh start adjustment to Prepaid expenses	(38.8)	(71.8)	(97.2)
Fresh start adjustment to Other current assets	(45.2)	(119.9)	(222.0)
Fresh start adjustment to Property and equipment, net	(691.4)	(769.2)	(3,916.5)
Fresh start adjustment to Intangible assets, net	(392.2)	(445.7)	(23.8)
Fresh start adjustment to Other assets	(215.4)	(212.9)	(266.9)
Fresh start adjustment to Other current liabilities	51.1	59.8	220.5
Fresh start adjustment to Finance lease liabilities – long-term	1.9	1.9	8.4
Reinstatement of long-term operating lease liabilities from liabilities subject to compromise	99.2		139.5
Fresh start adjustment to Other long-term liabilities for off-market long-term supply agreement	47.0		44.5
Changes in accumulated deficit	$ 415.8	0.0	$ 4,537.6
Fresh-Start Adjustments
Reorganization, Chapter 11 [Line Items]
Fresh start adjustment to Inventories, net		(6.8)
Fresh start adjustment to Prepaid expenses		0.1
Fresh start adjustment to Other current assets		(1.6)
Fresh start adjustment to Property and equipment, net		3,006.6
Fresh start adjustment to Intangible assets, net		(421.5)
Fresh start adjustment to Other assets		42.0
Fresh start adjustment to Other current liabilities		4.4
Fresh start adjustment to Finance lease liabilities – long-term		(6.4)
Reinstatement of long-term operating lease liabilities from liabilities subject to compromise		(46.4)
Fresh start adjustment to Other long-term liabilities for off-market long-term supply agreement		14.4
Reset of accumulated other comprehensive loss – securities-related		0.6
Total fresh start adjustments impacting reorganization items, net		2,585.4
Reset of accumulated other comprehensive loss - income tax effects		2.4
Income tax effects on deferred income taxes		(1.4)
Changes in accumulated deficit		$ 2,586.4

Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

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