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Restructuring Charges - Charges Taken Related to Restructuring Actions (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 24, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 41.1	$ 12.0	$ 2.4
Restructuring Charges | Fiscal 2022 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			1.9
Facility closure costs			0.5
Restructuring charges			2.4
Restructuring Charges | Fiscal 2023 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions		11.5
Other costs		0.5
Restructuring charges		12.0
Restructuring Charges | 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
Other costs	1.7
Restructuring charges	41.1
Restructuring Charges | Fiscal 2024 Actions | Fiscal 2022 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			0.0
Facility closure costs			0.0
Restructuring charges			0.0
Restructuring Charges | Fiscal 2024 Actions | Fiscal 2023 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions		0.0
Other costs		0.0
Restructuring charges		0.0
Restructuring Charges | 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
Other costs	1.2
Restructuring charges	36.7
Restructuring Charges | Fiscal 2023 Actions | Fiscal 2022 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			0.0
Facility closure costs			0.0
Restructuring charges			0.0
Restructuring Charges | Fiscal 2023 Actions | Fiscal 2023 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions		5.5
Other costs		0.0
Restructuring charges		5.5
Restructuring Charges | 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
Other costs	0.0
Restructuring charges	0.0
Restructuring Charges | Fiscal 2022 Actions | Fiscal 2022 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			2.6
Facility closure costs			0.5
Restructuring charges			3.1
Restructuring Charges | Fiscal 2022 Actions | Fiscal 2023 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions		6.0
Other costs		0.5
Restructuring charges		6.5
Restructuring Charges | Fiscal 2022 Actions | 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
Other costs	0.5
Restructuring charges	4.4
Restructuring Charges | Other | Fiscal 2022 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			(0.7)
Facility closure costs			0.0
Restructuring charges			$ (0.7)
Restructuring Charges | Other | Fiscal 2023 restructuring charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions		0.0
Other costs		0.0
Restructuring charges		$ 0.0
Restructuring Charges | Other | 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
Other costs	0.0
Restructuring charges	$ 0.0

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