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Restructuring Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - Restructuring Charges - USD ($) $ in Millions	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 24, 2016
Fiscal 2018 charges:
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	$ 14.2
Stock-based compensation	(1.3)
Severance payments	(13.7)
Other payments	(1.6)
Balance	9.1
Fiscal 2018 charges: | Fiscal 2018 Actions
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	12.6
Stock-based compensation	(1.3)
Severance payments	(6.8)
Other payments	(0.2)
Balance	4.3
Fiscal 2018 charges: | Fiscal 2017 Actions
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	0.0
Stock-based compensation	0.0
Severance payments	(6.7)
Other payments	0.0
Balance	0.8
Fiscal 2018 charges: | Fiscal 2016 Actions
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	1.6
Stock-based compensation	0.0
Severance payments	(0.2)
Other payments	(1.2)
Balance	3.9
Fiscal 2018 charges: | Previous Other Charges
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	0.0
Stock-based compensation	0.0
Severance payments	0.0
Other payments	(0.2)
Balance	0.1
Fiscal 2017 charges:
Restructuring Reserve [Roll Forward]
Balance	11.5
Fiscal restructuring charges		$ 13.3
Severance payments		(6.6)
Other payments		(1.5)
Balance		11.5
Fiscal 2017 charges: | Fiscal 2018 Actions
Restructuring Reserve [Roll Forward]
Balance	0.0
Fiscal restructuring charges		0.0
Severance payments		0.0
Other payments		0.0
Balance		0.0
Fiscal 2017 charges: | Fiscal 2017 Actions
Restructuring Reserve [Roll Forward]
Balance	7.5
Fiscal restructuring charges		8.5
Severance payments		(1.0)
Other payments		0.0
Balance		7.5
Fiscal 2017 charges: | Fiscal 2016 Actions
Restructuring Reserve [Roll Forward]
Balance	3.7
Fiscal restructuring charges		4.8
Severance payments		(5.4)
Other payments		(1.2)
Balance		3.7
Fiscal 2017 charges: | Previous Other Charges
Restructuring Reserve [Roll Forward]
Balance	$ 0.3
Fiscal restructuring charges		0.0
Severance payments		(0.2)
Other payments		(0.3)
Balance		0.3
Fiscal 2016 charges:
Restructuring Reserve [Roll Forward]
Balance		6.3
Fiscal restructuring charges			$ 10.5
Stock-based compensation			(0.4)
Severance payments			(9.0)
Other payments			(0.5)
Balance			6.3
Fiscal 2016 charges: | Fiscal 2018 Actions
Restructuring Reserve [Roll Forward]
Balance		0.0
Fiscal restructuring charges			0.0
Stock-based compensation			0.0
Severance payments			0.0
Other payments			0.0
Balance			0.0
Fiscal 2016 charges: | Fiscal 2017 Actions
Restructuring Reserve [Roll Forward]
Balance		0.0
Fiscal restructuring charges			0.0
Stock-based compensation			0.0
Severance payments			0.0
Other payments			0.0
Balance			0.0
Fiscal 2016 charges: | Fiscal 2016 Actions
Restructuring Reserve [Roll Forward]
Balance		5.5
Fiscal restructuring charges			10.5
Stock-based compensation			(0.4)
Severance payments			(4.6)
Other payments			0.0
Balance			5.5
Fiscal 2016 charges: | Previous Other Charges
Restructuring Reserve [Roll Forward]
Balance		$ 0.8
Fiscal restructuring charges			0.0
Stock-based compensation			0.0
Severance payments			(4.4)
Other payments			(0.5)
Balance			0.8
Fiscal 2015 charges:
Restructuring Reserve [Roll Forward]
Balance			5.7
Fiscal 2015 charges: | Fiscal 2018 Actions
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal 2015 charges: | Fiscal 2017 Actions
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal 2015 charges: | Fiscal 2016 Actions
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal 2015 charges: | Previous Other Charges
Restructuring Reserve [Roll Forward]
Balance			$ 5.7

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- Definition

Severance payments.

+ References

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- Definition

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+ References

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- Definition

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+ References

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- Definition

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+ References

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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/presentationRef
-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=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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

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- Definition

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