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Restructuring - Schedule of Restructuring (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 29, 2025	Sep. 28, 2025	Jun. 28, 2026	Jun. 28, 2026	Jun. 29, 2025
2025 Restructuring Plan
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 30.7	$ 30.7	$ 19.2	$ 19.2	$ 0.0
Charges		2.4	1.6		91.5
Usage		(13.9)	(15.7)		(60.8)
Restructuring reserve, ending balance	19.2		5.1	5.1	30.7
2025 Restructuring Plan \| Employee severance and benefit costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	25.2	25.2	13.4	13.4	0.0
Charges	0.1	0.1	0.0	0.0	72.9
Usage		(11.9)	(12.4)		(47.7)
Restructuring reserve, ending balance	13.4		1.0	1.0	25.2
2025 Restructuring Plan \| Contract termination liability
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	5.5	5.5	5.8	5.8	0.0
Charges	2.3	2.3	1.6	1.6	18.6
Usage		$ (2.0)	(3.3)		(13.1)
Restructuring reserve, ending balance	$ 5.8		4.1	4.1	$ 5.5
2026 Restructuring Plan, Second Quarter Reduction
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			0.0
Charges			7.5
Usage			(6.7)
Restructuring reserve, ending balance			0.8	0.8
2026 Restructuring Plan, Second Quarter Reduction \| Employee severance and benefit costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			0.0
Charges			7.5	7.5
Usage			(6.7)
Restructuring reserve, ending balance			0.8	0.8
2026 Restructuring Plan, Fourth Quarter Reduction
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			0.0
Charges			3.0
Usage			0.0
Restructuring reserve, ending balance			3.0	3.0
2026 Restructuring Plan, Fourth Quarter Reduction \| Employee severance and benefit costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			0.0
Charges			3.0	3.0
Usage			0.0
Restructuring reserve, ending balance			$ 3.0	$ 3.0