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Restructuring Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - Restructuring Charges - USD ($) $ in Millions	12 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 28, 2019
Fiscal 2018 restructuring charges
Restructuring Reserve [Roll Forward]
Balance			$ 9.1
Fiscal 2018 restructuring charges | Fiscal 2021 Actions
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal 2018 restructuring charges | Fiscal 2020 Actions
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal 2018 restructuring charges | Fiscal 2019 Actions
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal 2018 restructuring charges | Fiscal 2018 Actions
Restructuring Reserve [Roll Forward]
Balance			4.3
Fiscal 2018 restructuring charges | Previous Other Charges
Restructuring Reserve [Roll Forward]
Balance			4.8
Fiscal 2019 restructuring charges
Restructuring Reserve [Roll Forward]
Balance		$ 5.9
Fiscal restructuring charges			6.6
Severance payments and adjustments			(7.7)
Other payments			(2.1)
Balance			5.9
Fiscal 2019 restructuring charges | Fiscal 2021 Actions
Restructuring Reserve [Roll Forward]
Balance		0.0
Fiscal restructuring charges			0.0
Severance payments and adjustments			0.0
Other payments			0.0
Balance			0.0
Fiscal 2019 restructuring charges | Fiscal 2020 Actions
Restructuring Reserve [Roll Forward]
Balance		0.0
Fiscal restructuring charges			0.0
Severance payments and adjustments			0.0
Other payments			0.0
Balance			0.0
Fiscal 2019 restructuring charges | Fiscal 2019 Actions
Restructuring Reserve [Roll Forward]
Balance		1.0
Fiscal restructuring charges			4.0
Severance payments and adjustments			(3.0)
Other payments			0.0
Balance			1.0
Fiscal 2019 restructuring charges | Fiscal 2018 Actions
Restructuring Reserve [Roll Forward]
Balance		1.1
Fiscal restructuring charges			1.2
Severance payments and adjustments			(3.9)
Other payments			(0.5)
Balance			1.1
Fiscal 2019 restructuring charges | Previous Other Charges
Restructuring Reserve [Roll Forward]
Balance		3.8
Fiscal restructuring charges			1.4
Severance payments and adjustments			(0.8)
Other payments			(1.6)
Balance			$ 3.8
Fiscal 2020 restructuring charges
Restructuring Reserve [Roll Forward]
Balance	$ 4.5
Fiscal restructuring charges	8.7	15.3
Stock-based compensation		(7.5)
Severance payments and adjustments		(5.9)
Other payments		(3.3)
Balance		4.5
Fiscal 2020 restructuring charges | Fiscal 2021 Actions
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		0.0
Balance		0.0
Fiscal 2020 restructuring charges | Fiscal 2020 Actions
Restructuring Reserve [Roll Forward]
Balance	3.7
Fiscal restructuring charges		15.1
Stock-based compensation		(7.5)
Severance payments and adjustments		(4.4)
Other payments		0.5
Balance		3.7
Fiscal 2020 restructuring charges | Fiscal 2019 Actions
Restructuring Reserve [Roll Forward]
Balance	0.0
Fiscal restructuring charges		0.3
Stock-based compensation		0.0
Severance payments and adjustments		(1.3)
Other payments		0.0
Balance		0.0
Fiscal 2020 restructuring charges | Fiscal 2018 Actions
Restructuring Reserve [Roll Forward]
Balance	0.8
Fiscal restructuring charges		(0.1)
Stock-based compensation		0.0
Severance payments and adjustments		(0.2)
Other payments		0.0
Balance		0.8
Fiscal 2020 restructuring charges | Previous Other 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		(3.8)
Balance		$ 0.0
Fiscal 2021 restructuring charges
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	9.3
Stock-based compensation	(0.9)
Severance payments and adjustments	(8.8)
Balance	4.1
Fiscal 2021 restructuring charges | Fiscal 2021 Actions
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	8.7
Stock-based compensation	(0.9)
Severance payments and adjustments	(4.6)
Balance	3.2
Fiscal 2021 restructuring charges | Fiscal 2020 Actions
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	0.6
Stock-based compensation	0.0
Severance payments and adjustments	(3.4)
Balance	0.9
Fiscal 2021 restructuring charges | Fiscal 2019 Actions
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	0.0
Stock-based compensation	0.0
Severance payments and adjustments	0.0
Balance	0.0
Fiscal 2021 restructuring charges | Fiscal 2018 Actions
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	0.0
Stock-based compensation	0.0
Severance payments and adjustments	(0.8)
Balance	0.0
Fiscal 2021 restructuring charges | Previous Other Charges
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	0.0
Stock-based compensation	0.0
Severance payments and adjustments	0.0
Balance	$ 0.0

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- Definition

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- Definition

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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