Restructuring and Divestiture Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Restructuring Reserve [Roll Forward]
Non-cash impairment charges	$ (38.4)	$ (9.4)	$ (16.9)
Fiscal 2012 Charges [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges			(16.9)
Fiscal restructuring charges			36.5
Stock-based compensation			(3.5)
Severance payments			(2.6)
Other payments			(2.9)
Acquired and other			0.2
Balance			10.8
Fiscal 2012 Charges [Member] \| Adiana Permanent Contraception System [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges			(16.3)
Fiscal restructuring charges			19.5
Stock-based compensation			0
Severance payments			(0.1)
Other payments			(2.6)
Acquired and other			0
Balance			0.5
Fiscal 2012 Charges [Member] \| Consolidation of Diagnostics Operations [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges			(0.6)
Fiscal restructuring charges			14.8
Stock-based compensation			(3.5)
Severance payments			(2.4)
Other payments			0
Acquired and other			0.1
Balance			8.4
Fiscal 2012 Charges [Member] \| Closure of Indianapolis Facility [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges			0
Fiscal restructuring charges			1.8
Stock-based compensation			0
Severance payments			0
Other payments			0
Acquired and other			0
Balance			1.8
Fiscal 2012 Charges [Member] \| Fiscal 2014 Actions [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges			0
Fiscal restructuring charges			0
Stock-based compensation			0
Severance payments			0
Other payments			0
Acquired and other			0
Balance			0
Fiscal 2012 Charges [Member] \| Fiscal 2013 Actions [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges			0
Fiscal restructuring charges			0
Stock-based compensation			0
Severance payments			0
Other payments			0
Acquired and other			0
Balance			0
Fiscal 2012 Charges [Member] \| Other Operating Cost Reductions [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges			0
Fiscal restructuring charges			0.4
Stock-based compensation			0
Severance payments			(0.1)
Other payments			(0.3)
Acquired and other			0.1
Balance			0.1
Fiscal 2013 Charges [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
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] \| Adiana Permanent Contraception System [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges		0
Fiscal restructuring charges		0
Stock-based compensation		0
Severance payments		0
Other payments		(0.5)
Balance		0
Fiscal 2013 Charges [Member] \| Consolidation of Diagnostics Operations [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges		0
Fiscal restructuring charges		14.0
Stock-based compensation		(6.3)
Severance payments		(13.1)
Other payments		0
Balance		3.0
Fiscal 2013 Charges [Member] \| Closure of Indianapolis Facility [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges		0
Fiscal restructuring charges		5.7
Stock-based compensation		0
Severance payments		(3.1)
Other payments		(0.6)
Balance		3.8
Fiscal 2013 Charges [Member] \| Fiscal 2014 Actions [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges		0
Fiscal restructuring charges		0
Stock-based compensation		0
Severance payments		0
Other payments		0
Balance		0
Fiscal 2013 Charges [Member] \| Fiscal 2013 Actions [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges		0
Fiscal restructuring charges		11.3
Stock-based compensation		(1.6)
Severance payments		(4.4)
Other payments		0
Balance		5.3
Fiscal 2013 Charges [Member] \| Other Operating Cost Reductions [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges		(0.1)
Fiscal restructuring charges		1.7
Stock-based compensation		0
Severance payments		(0.9)
Other payments		(0.6)
Balance		0.2
Fiscal 2014 Charges [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
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] \| Adiana Permanent Contraception System [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges	0
Fiscal restructuring charges	0
Stock-based compensation	0
Severance payments	0
Other payments	0
Balance	0
Fiscal 2014 Charges [Member] \| Consolidation of Diagnostics Operations [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges	0
Fiscal restructuring charges	3.0
Stock-based compensation	0
Severance payments	(3.0)
Other payments	0
Balance	3.0
Fiscal 2014 Charges [Member] \| Closure of Indianapolis Facility [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges	0
Fiscal restructuring charges	0.7
Stock-based compensation	0
Severance payments	(4.0)
Other payments	(0.5)
Balance	0
Fiscal 2014 Charges [Member] \| Fiscal 2014 Actions [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges	0
Fiscal restructuring charges	29.5
Stock-based compensation	(6.6)
Severance payments	(10.9)
Other payments	0
Balance	12.0
Fiscal 2014 Charges [Member] \| Fiscal 2013 Actions [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges	0
Fiscal restructuring charges	0.9
Stock-based compensation	0
Severance payments	(6.1)
Other payments	0
Balance	0.1
Fiscal 2014 Charges [Member] \| Other Operating Cost Reductions [Member] \| Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Non-cash impairment charges	(3.1)
Fiscal restructuring charges	12.1
Stock-based compensation	0
Severance payments	(7.0)
Other payments	(0.4)
Balance	$ 1.8