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Restructuring and Divestiture Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - Restructuring Charges [Member] - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 24, 2016	Sep. 26, 2015
Two Thousand Seventeen [Member]
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	$ 13.3
Severance payments	(6.6)
Other payments	(1.5)
Balance	11.5
Two Thousand Seventeen [Member] | Fiscal 2017 Actions [Member]
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	8.5
Severance payments	(1.0)
Other payments	0.0
Balance	7.5
Two Thousand Seventeen [Member] | Fiscal 2016 Actions [Domain]
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	4.8
Severance payments	(5.4)
Other payments	(1.2)
Balance	3.7
Two Thousand Seventeen [Member] | Fiscal 2015 Actions [Member]
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	0.0
Severance payments	(0.2)
Other payments	0.0
Balance	0.0
Two Thousand Seventeen [Member] | Fiscal 2014 Actions [Member]
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	0.0
Severance payments	0.0
Other payments	(0.3)
Balance	0.3
Two Thousand Seventeen [Member] | Other Operating Cost Reductions [Member]
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	0.0
Severance payments	0.0
Other payments	0.0
Balance	0.0
Fiscal 2016 Charges [Member]
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 [Member] | Fiscal 2017 Actions [Member]
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 [Member] | Fiscal 2016 Actions [Domain]
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 [Member] | Fiscal 2015 Actions [Member]
Restructuring Reserve [Roll Forward]
Balance	0.2
Fiscal restructuring charges		0.0
Stock-based compensation		0.0
Severance payments		(2.9)
Other payments		0.0
Balance		0.2
Fiscal 2016 Charges [Member] | Fiscal 2014 Actions [Member]
Restructuring Reserve [Roll Forward]
Balance	0.6
Fiscal restructuring charges		0.0
Stock-based compensation		0.0
Severance payments		(1.4)
Other payments		(0.5)
Balance		0.6
Fiscal 2016 Charges [Member] | Other Operating Cost Reductions [Member]
Restructuring Reserve [Roll Forward]
Balance	$ 0.0
Fiscal restructuring charges		0.0
Stock-based compensation		0.0
Severance payments		(0.1)
Other payments		0.0
Balance		0.0
Fiscal 2015 Charges [Member]
Restructuring Reserve [Roll Forward]
Balance		5.7
Fiscal restructuring charges			$ 18.9
Stock-based compensation			(4.1)
Severance payments			(23.9)
Other payments			(2.1)
Balance			5.7
Fiscal 2015 Charges [Member] | Fiscal 2017 Actions [Member]
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 2015 Charges [Member] | Fiscal 2016 Actions [Domain]
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 2015 Charges [Member] | Fiscal 2015 Actions [Member]
Restructuring Reserve [Roll Forward]
Balance		3.1
Fiscal restructuring charges			10.0
Stock-based compensation			(4.1)
Severance payments			(2.8)
Other payments			0.0
Balance			3.1
Fiscal 2015 Charges [Member] | Fiscal 2014 Actions [Member]
Restructuring Reserve [Roll Forward]
Balance		2.5
Fiscal restructuring charges			8.0
Stock-based compensation			0.0
Severance payments			(16.2)
Other payments			(1.3)
Balance			2.5
Fiscal 2015 Charges [Member] | Other Operating Cost Reductions [Member]
Restructuring Reserve [Roll Forward]
Balance		$ 0.1
Fiscal restructuring charges			0.9
Stock-based compensation			0.0
Severance payments			(4.9)
Other payments			(0.8)
Balance			0.1
Fiscal 2014 Charges [Member]
Restructuring Reserve [Roll Forward]
Balance			16.9
Fiscal 2014 Charges [Member] | Fiscal 2017 Actions [Member]
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal 2014 Charges [Member] | Fiscal 2016 Actions [Domain]
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal 2014 Charges [Member] | Fiscal 2015 Actions [Member]
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal 2014 Charges [Member] | Fiscal 2014 Actions [Member]
Restructuring Reserve [Roll Forward]
Balance			12.0
Fiscal 2014 Charges [Member] | Other Operating Cost Reductions [Member]
Restructuring Reserve [Roll Forward]
Balance			$ 4.9

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- Definition

Severance payments.

+ References

No definition available.

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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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+ References

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