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Restructuring and Divestiture Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 24, 2016	Sep. 26, 2015	Sep. 27, 2014
Restructuring Reserve [Roll Forward]
Non-cash impairment charges	$ 0.0	$ 0.0	$ (38.4)
Fiscal 2013 Charges [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance			12.3
Fiscal 2013 Charges [Member] | Fiscal 2016 Actions [Domain] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal 2013 Charges [Member] | Fiscal 2015 Actions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal 2013 Charges [Member] | Fiscal 2014 Actions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal 2013 Charges [Member] | Consolidation of Diagnostics Operations [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance			3.0
Fiscal 2013 Charges [Member] | Other Operating Cost Reductions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance			9.3
Fiscal 2014 Charges [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance		16.9
Fiscal restructuring charges			46.2
Stock-based compensation			(6.6)
Non-cash impairment charges			(3.1)
Severance payments			(31.0)
Other payments			(0.9)
Balance			16.9
Fiscal 2014 Charges [Member] | Fiscal 2016 Actions [Domain] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance		0.0
Fiscal restructuring charges			0.0
Stock-based compensation			0.0
Non-cash impairment charges			0.0
Severance payments			0.0
Other payments			0.0
Balance			0.0
Fiscal 2014 Charges [Member] | Fiscal 2015 Actions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance		0.0
Fiscal restructuring charges			0.0
Stock-based compensation			0.0
Non-cash impairment charges			0.0
Severance payments			0.0
Other payments			0.0
Balance			0.0
Fiscal 2014 Charges [Member] | Fiscal 2014 Actions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance		12.0
Fiscal restructuring charges			29.5
Stock-based compensation			(6.6)
Non-cash impairment charges			0.0
Severance payments			(10.9)
Other payments			0.0
Balance			12.0
Fiscal 2014 Charges [Member] | Consolidation of Diagnostics Operations [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance		(3.0)
Fiscal restructuring charges			3.0
Stock-based compensation			0.0
Non-cash impairment charges			0.0
Severance payments			(3.0)
Other payments			0.0
Balance			(3.0)
Fiscal 2014 Charges [Member] | Other Operating Cost Reductions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance		1.9
Fiscal restructuring charges			13.7
Stock-based compensation			0.0
Non-cash impairment charges			(3.1)
Severance payments			(17.1)
Other payments			(0.9)
Balance			$ 1.9
Fiscal 2015 Charges [Member] | Restructuring 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 2016 Actions [Domain] | Restructuring Charges [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 2015 Actions [Member] | Restructuring Charges [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 Charges [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] | Consolidation of Diagnostics Operations [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance	(0.1)
Fiscal restructuring charges		0.6
Stock-based compensation		0.0
Severance payments		(3.0)
Other payments		(0.5)
Balance		(0.1)
Fiscal 2015 Charges [Member] | Other Operating Cost Reductions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance	0.0
Fiscal restructuring charges		0.3
Stock-based compensation		0.0
Severance payments		1.9
Other payments		0.3
Balance		$ 0.0
Fiscal 2016 Charges [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
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 2016 Actions [Domain] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
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 Charges [Member]
Restructuring Reserve [Roll Forward]
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 Charges [Member]
Restructuring Reserve [Roll Forward]
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] | Consolidation of Diagnostics Operations [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	0.0
Stock-based compensation	0.0
Severance payments	0.1
Other payments	0.0
Balance	0.0
Fiscal 2016 Charges [Member] | Other Operating Cost Reductions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	0.0
Stock-based compensation	0.0
Severance payments	0.0
Other payments	0.0
Balance	$ 0.0

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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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 SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section P
-Subsection 3, 4

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