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Restructuring Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 24, 2022	Sep. 25, 2021	Sep. 26, 2020
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges		$ 8.7
Fiscal 2020 restructuring charges | Restructuring Charges
Restructuring Reserve [Roll Forward]
Balance			$ 5.9
Fiscal restructuring charges			15.3
Stock-based compensation			(7.5)
Severance payments and adjustments			(5.9)
Other payments and adjustments			(3.3)
Fiscal 2020 restructuring charges | Fiscal 2022 Actions | Restructuring Charges
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal restructuring charges			0.0
Stock-based compensation			0.0
Severance payments and adjustments			0.0
Other payments and adjustments			0.0
Fiscal 2020 restructuring charges | Fiscal 2021 Actions | Restructuring Charges
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal restructuring charges			0.0
Stock-based compensation			0.0
Severance payments and adjustments			0.0
Other payments and adjustments			0.0
Fiscal 2020 restructuring charges | Fiscal 2020 Actions | Restructuring Charges
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal restructuring charges			15.1
Stock-based compensation			(7.5)
Severance payments and adjustments			(4.4)
Other payments and adjustments			0.5
Fiscal 2020 restructuring charges | Previous Other Charges | Restructuring Charges
Restructuring Reserve [Roll Forward]
Balance			5.9
Fiscal restructuring charges			0.2
Stock-based compensation			0.0
Severance payments and adjustments			(1.5)
Other payments and adjustments			(3.8)
Fiscal 2021 restructuring charges | Restructuring Charges
Restructuring Reserve [Roll Forward]
Balance	$ 4.1	4.5
Fiscal restructuring charges		9.3
Stock-based compensation		(0.9)
Severance payments and adjustments		(8.8)
Balance		4.1	4.5
Fiscal 2021 restructuring charges | Fiscal 2022 Actions | Restructuring Charges
Restructuring Reserve [Roll Forward]
Balance	0.0	0.0
Fiscal restructuring charges		0.0
Stock-based compensation		0.0
Severance payments and adjustments		0.0
Balance		0.0	0.0
Fiscal 2021 restructuring charges | Fiscal 2021 Actions | Restructuring Charges
Restructuring Reserve [Roll Forward]
Balance	3.2	0.0
Fiscal restructuring charges		8.7
Stock-based compensation		(0.9)
Severance payments and adjustments		(4.6)
Balance		3.2	0.0
Fiscal 2021 restructuring charges | Fiscal 2020 Actions | Restructuring Charges
Restructuring Reserve [Roll Forward]
Balance	0.9	3.7
Fiscal restructuring charges		0.6
Stock-based compensation		0.0
Severance payments and adjustments		(3.4)
Balance		0.9	3.7
Fiscal 2021 restructuring charges | Previous Other Charges | Restructuring Charges
Restructuring Reserve [Roll Forward]
Balance	0.0	0.8
Fiscal restructuring charges		0.0
Stock-based compensation		0.0
Severance payments and adjustments		(0.8)
Balance		$ 0.0	$ 0.8
Fiscal 2022 restructuring charges | Restructuring Charges
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	2.4
Severance payments and adjustments	(3.4)
Balance	3.1
Fiscal 2022 restructuring charges | Fiscal 2022 Actions | Restructuring Charges
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	3.1
Severance payments and adjustments	(0.4)
Balance	2.7
Fiscal 2022 restructuring charges | Fiscal 2021 Actions | Restructuring Charges
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	(0.3)
Severance payments and adjustments	(2.5)
Balance	0.4
Fiscal 2022 restructuring charges | Fiscal 2020 Actions | Restructuring Charges
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	(0.4)
Severance payments and adjustments	(0.5)
Balance	0.0
Fiscal 2022 restructuring charges | Previous Other Charges | Restructuring Charges
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	0.0
Severance payments and adjustments	0.0
Balance	$ 0.0

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+ References

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- Definition

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- Definition

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- Definition

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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