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Restructuring Charges - Charges Taken Related to Restructuring Actions (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 28.6	$ 41.1	$ 12.0
Fiscal 2023 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			11.5
Facility closure costs			0.5
Restructuring charges			12.0
Fiscal 2024 restructuring charges
Restructuring Cost and Reserve [Line Items]
Lease asset impairment charge		12.5
Accelerated depreciation expense		7.2
Workforce reductions		19.7
Facility closure and other costs		1.7
Restructuring charges		41.1
Fiscal 2025 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions	25.4
Facility closure and other costs	3.2
Restructuring charges	28.6
Fiscal 2025 Actions | Fiscal 2023 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			0.0
Facility closure costs			0.0
Restructuring charges			0.0
Fiscal 2025 Actions | Fiscal 2024 restructuring charges
Restructuring Cost and Reserve [Line Items]
Lease asset impairment charge		0.0
Accelerated depreciation expense		0.0
Workforce reductions		0.0
Facility closure and other costs		0.0
Restructuring charges		0.0
Fiscal 2025 Actions | Fiscal 2025 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions	20.9
Facility closure and other costs	1.1
Restructuring charges	22.0
Fiscal 2024 Actions | Fiscal 2023 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			0.0
Facility closure costs			0.0
Restructuring charges			0.0
Fiscal 2024 Actions | Fiscal 2024 restructuring charges
Restructuring Cost and Reserve [Line Items]
Lease asset impairment charge		12.5
Accelerated depreciation expense		7.2
Workforce reductions		15.8
Facility closure and other costs		1.2
Restructuring charges		36.7
Fiscal 2024 Actions | Fiscal 2025 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions	3.1
Facility closure and other costs	0.3
Restructuring charges	3.4
Fiscal 2023 Actions | Fiscal 2023 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			5.5
Facility closure costs			0.0
Restructuring charges			5.5
Fiscal 2023 Actions | Fiscal 2024 restructuring charges
Restructuring Cost and Reserve [Line Items]
Lease asset impairment charge		0.0
Accelerated depreciation expense		0.0
Workforce reductions		0.0
Facility closure and other costs		0.0
Restructuring charges		0.0
Fiscal 2023 Actions | Fiscal 2025 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions	0.0
Facility closure and other costs	0.0
Restructuring charges	0.0
Other | Fiscal 2023 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			6.0
Facility closure costs			0.5
Restructuring charges			$ 6.5
Other | Fiscal 2024 restructuring charges
Restructuring Cost and Reserve [Line Items]
Lease asset impairment charge		0.0
Accelerated depreciation expense		0.0
Workforce reductions		3.9
Facility closure and other costs		0.5
Restructuring charges		$ 4.4
Other | Fiscal 2025 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions	1.4
Facility closure and other costs	1.8
Restructuring charges	$ 3.2

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