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Business Segments and Geographic Information - Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 26, 2015	Sep. 27, 2014	Sep. 28, 2013
Segment Reporting Information [Line Items]
Total revenues	$ 702.8	$ 693.9	$ 655.5	$ 652.8	$ 660.6	$ 632.6	$ 625.0	$ 612.4	$ 2,705.0	$ 2,530.7	$ 2,492.3
Operating income (loss)									455.1	279.7	(906.2)
Depreciation and amortization									491.4	523.2	516.0
Capital expenditures									89.4	80.2	90.1
Identifiable assets	7,670.1				8,414.7				7,670.1	8,414.7	9,000.8
Diagnostics [Member]
Segment Reporting Information [Line Items]
Total revenues									1,211.8	1,186.8	1,189.8
Operating income (loss)									109.5	48.7	(1,149.1)
Depreciation and amortization									358.7	376.0	369.8
Capital expenditures									55.6	52.2	51.6
Identifiable assets	4,055.8				4,383.5				4,055.8	4,383.5	4,667.9
Breast Health [Member]
Segment Reporting Information [Line Items]
Total revenues									1,063.4	944.7	905.1
Operating income (loss)									296.3	187.6	216.1
Depreciation and amortization									28.6	41.7	40.1
Capital expenditures									12.8	10.0	16.4
Identifiable assets	815.4				859.8				815.4	859.8	932.2
GYN Surgical [Member]
Segment Reporting Information [Line Items]
Total revenues									335.8	307.9	307.1
Operating income (loss)									38.6	30.3	19.7
Depreciation and amortization									102.7	104.6	105.2
Capital expenditures									9.5	8.0	9.1
Identifiable assets	1,658.1				1,748.2				1,658.1	1,748.2	1,849.5
Skeletal Health [Member]
Segment Reporting Information [Line Items]
Total revenues									94.0	91.3	90.3
Operating income (loss)									10.7	13.1	7.1
Depreciation and amortization									1.4	0.9	0.9
Capital expenditures									0.4	0.4	0.6
Identifiable assets	25.3				26.1				25.3	26.1	33.5
Corporate [Member]
Segment Reporting Information [Line Items]
Capital expenditures									11.1	9.6	12.4
Identifiable assets	$ 1,115.5				$ 1,397.1				$ 1,115.5	$ 1,397.1	$ 1,517.7

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