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Restructuring and Divestiture Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 28, 2013
Restructuring Reserve [Roll Forward]
Non-cash impairment charges	$ 0.0	$ (38.4)	$ (9.4)
Fiscal 2012 Charges [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance			10.8
Fiscal 2012 Charges [Member] | Consolidation of Diagnostics Operations [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance			8.4
Fiscal 2012 Charges [Member] | Closure of Indianapolis Facility [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance			1.8
Fiscal 2012 Charges [Member] | Restructuring Action Two Thousand Fifteen [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal 2012 Charges [Member] | Fiscal 2014 Actions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal 2012 Charges [Member] | Fiscal 2013 Actions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance			0.0
Fiscal 2012 Charges [Member] | Other Operating Cost Reductions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance			0.6
Fiscal 2013 Charges [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance		12.3
Non-cash impairment charges			0.1
Fiscal restructuring charges			32.7
Stock-based compensation			(7.9)
Severance payments			(21.5)
Other payments			(1.7)
Balance			12.3
Fiscal 2013 Charges [Member] | Consolidation of Diagnostics Operations [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance		3.0
Non-cash impairment charges			0.0
Fiscal restructuring charges			14.0
Stock-based compensation			(6.3)
Severance payments			(13.1)
Other payments			0.0
Balance			3.0
Fiscal 2013 Charges [Member] | Closure of Indianapolis Facility [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance		3.8
Non-cash impairment charges			0.0
Fiscal restructuring charges			5.7
Stock-based compensation			0.0
Severance payments			(3.1)
Other payments			(0.6)
Balance			3.8
Fiscal 2013 Charges [Member] | Restructuring Action Two Thousand Fifteen [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance		0.0
Non-cash impairment charges			0.0
Fiscal restructuring charges			0.0
Stock-based compensation			0.0
Severance payments			0.0
Other payments			0.0
Balance			0.0
Fiscal 2013 Charges [Member] | Fiscal 2014 Actions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance		0.0
Non-cash impairment charges			0.0
Fiscal restructuring charges			0.0
Stock-based compensation			0.0
Severance payments			0.0
Other payments			0.0
Balance			0.0
Fiscal 2013 Charges [Member] | Fiscal 2013 Actions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance		5.3
Non-cash impairment charges			0.0
Fiscal restructuring charges			11.3
Stock-based compensation			(1.6)
Severance payments			(4.4)
Other payments			0.0
Balance			5.3
Fiscal 2013 Charges [Member] | Other Operating Cost Reductions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance		0.2
Non-cash impairment charges			0.1
Fiscal restructuring charges			1.7
Stock-based compensation			0.0
Severance payments			(0.9)
Other payments			(1.1)
Balance			$ 0.2
Fiscal 2014 Charges [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance	16.9
Non-cash impairment charges		(3.1)
Fiscal restructuring charges		46.2
Stock-based compensation		(6.6)
Severance payments		(31.0)
Other payments		(0.9)
Balance		16.9
Fiscal 2014 Charges [Member] | Consolidation of Diagnostics Operations [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance	3.0
Non-cash impairment charges		0.0
Fiscal restructuring charges		3.0
Stock-based compensation		0.0
Severance payments		(3.0)
Other payments		0.0
Balance		3.0
Fiscal 2014 Charges [Member] | Closure of Indianapolis Facility [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance	0.0
Non-cash impairment charges		0.0
Fiscal restructuring charges		0.7
Stock-based compensation		0.0
Severance payments		(4.0)
Other payments		(0.5)
Balance		0.0
Fiscal 2014 Charges [Member] | Restructuring Action Two Thousand Fifteen [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance	0.0
Non-cash impairment charges		0.0
Fiscal restructuring charges		0.0
Stock-based compensation		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
Non-cash impairment charges		0.0
Fiscal restructuring charges		29.5
Stock-based compensation		(6.6)
Severance payments		(10.9)
Other payments		0.0
Balance		12.0
Fiscal 2014 Charges [Member] | Fiscal 2013 Actions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance	0.1
Non-cash impairment charges		0.0
Fiscal restructuring charges		0.9
Stock-based compensation		0.0
Severance payments		(6.1)
Other payments		0.0
Balance		0.1
Fiscal 2014 Charges [Member] | Other Operating Cost Reductions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance	1.8
Non-cash impairment charges		(3.1)
Fiscal restructuring charges		12.1
Stock-based compensation		0.0
Severance payments		(7.0)
Other payments		(0.4)
Balance		$ 1.8
Two Thousand Fifteen [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	18.9
Stock-based compensation	4.1
Severance payments	23.9
Other payments	2.1
Balance	5.7
Two Thousand Fifteen [Member] | Consolidation of Diagnostics Operations [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	0.6
Stock-based compensation	0.0
Severance payments	(3.0)
Other payments	(0.5)
Balance	0.1
Two Thousand Fifteen [Member] | Closure of Indianapolis Facility [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
Two Thousand Fifteen [Member] | Restructuring Action Two Thousand Fifteen [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	10.0
Stock-based compensation	4.1
Severance payments	2.8
Other payments	0.0
Balance	3.1
Two Thousand Fifteen [Member] | Fiscal 2014 Actions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	8.0
Stock-based compensation	0.0
Severance payments	(16.2)
Other payments	(1.3)
Balance	2.5
Two Thousand Fifteen [Member] | Fiscal 2013 Actions [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
Two Thousand Fifteen [Member] | Other Operating Cost Reductions [Member] | Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Fiscal restructuring charges	0.3
Stock-based compensation	0.0
Severance payments	1.8
Other payments	0.3
Balance	$ 0.0

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