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Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Property and Equipment (Details) - USD ($) $ in Millions	Jun. 28, 2026	Sep. 29, 2025	Jun. 29, 2025
Property, Plant, and Equipment [Line Items]
Property and equipment, gross	$ 726.7		$ 5,195.3
Accumulated depreciation	(35.3)		(1,278.8)
Property and equipment, net	691.4	$ 769.2	3,916.5
Machinery and equipment
Property, Plant, and Equipment [Line Items]
Property and equipment, gross	106.0		1,614.8
Land and buildings
Property, Plant, and Equipment [Line Items]
Property and equipment, gross	457.3		1,080.5
Computer hardware/software
Property, Plant, and Equipment [Line Items]
Property and equipment, gross	4.2		75.4
Furniture and fixtures
Property, Plant, and Equipment [Line Items]
Property and equipment, gross	0.6		8.7
Leasehold improvements and other
Property, Plant, and Equipment [Line Items]
Property and equipment, gross	10.3		139.1
Vehicles
Property, Plant, and Equipment [Line Items]
Property and equipment, gross	0.0		0.5
Finance lease assets
Property, Plant, and Equipment [Line Items]
Finance lease assets	2.1		8.3
Construction in progress
Property, Plant, and Equipment [Line Items]
Property and equipment, gross	$ 146.2		$ 2,268.0