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Restructuring Charges - Charges Taken Related to Accrued Restructuring Actions (Details) - Restructuring Charges - USD ($) $ in Millions	12 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 24, 2022
Fiscal 2022 restructuring charges
Restructuring Reserve [Roll Forward]
Balance			$ 4.1
Fiscal restructuring charges			2.4
Severance payments and adjustments			(3.4)
Fiscal 2023 restructuring charges
Restructuring Reserve [Roll Forward]
Balance	$ 9.0	$ 3.1
Fiscal restructuring charges		12.0
Severance payments and adjustments		(6.1)
Balance		9.0	3.1
Fiscal 2024 restructuring charges
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	41.1
Non-cash impairment charge	(12.5)
Non-cash accelerated depreciation charge	(7.2)
Severance payments and adjustments	(18.4)
Balance	12.0
Fiscal 2024 Actions | Fiscal 2022 restructuring charges
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal restructuring charges			0.0
Severance payments and adjustments			0.0
Fiscal 2024 Actions | Fiscal 2023 restructuring charges
Restructuring Reserve [Roll Forward]
Balance	0.0	0.0
Fiscal restructuring charges		0.0
Severance payments and adjustments		0.0
Balance		0.0	0.0
Fiscal 2024 Actions | Fiscal 2024 restructuring charges
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	36.7
Non-cash impairment charge	(12.5)
Non-cash accelerated depreciation charge	(7.2)
Severance payments and adjustments	(11.5)
Balance	5.5
Fiscal 2023 Actions | Fiscal 2022 restructuring charges
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal restructuring charges			0.0
Severance payments and adjustments			0.0
Fiscal 2023 Actions | Fiscal 2023 restructuring charges
Restructuring Reserve [Roll Forward]
Balance	2.3	0.0
Fiscal restructuring charges		5.5
Severance payments and adjustments		(3.2)
Balance		2.3	0.0
Fiscal 2023 Actions | Fiscal 2024 restructuring charges
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	0.0
Non-cash impairment charge	0.0
Non-cash accelerated depreciation charge	0.0
Severance payments and adjustments	(2.0)
Balance	0.3
Fiscal 2022 Actions | Fiscal 2022 restructuring charges
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal restructuring charges			3.1
Severance payments and adjustments			(0.4)
Fiscal 2022 Actions | Fiscal 2023 restructuring charges
Restructuring Reserve [Roll Forward]
Balance	6.7	2.7
Fiscal restructuring charges		6.5
Severance payments and adjustments		(2.5)
Balance		6.7	2.7
Fiscal 2022 Actions | Fiscal 2024 restructuring charges
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	4.4
Non-cash impairment charge	0.0
Non-cash accelerated depreciation charge	0.0
Severance payments and adjustments	(4.9)
Balance	6.2
Other | Fiscal 2022 restructuring charges
Restructuring Reserve [Roll Forward]
Balance			4.1
Fiscal restructuring charges			(0.7)
Severance payments and adjustments			(3.0)
Other | Fiscal 2023 restructuring charges
Restructuring Reserve [Roll Forward]
Balance	0.0	0.4
Fiscal restructuring charges		0.0
Severance payments and adjustments		(0.4)
Balance		$ 0.0	$ 0.4
Other | Fiscal 2024 restructuring charges
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	0.0
Non-cash impairment charge	0.0
Non-cash accelerated depreciation charge	0.0
Severance payments and adjustments	0.0
Balance	$ 0.0

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Severance payments.

+ References

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- Definition

Total restructuring charges under exit or disposal plan.

+ References

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- Definition

Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482017/420-10-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479823/420-10-S99-2

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Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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