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Business Segments and Geographic Information - Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 24, 2016	Jun. 25, 2016	Mar. 26, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 24, 2016	Sep. 26, 2015	Sep. 27, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 726.8	$ 717.4	$ 693.3	$ 695.2	$ 702.8	$ 693.9	$ 655.5	$ 652.8	$ 2,832.7	$ 2,705.0	$ 2,530.7
Operating income (loss)									548.6	455.1	279.7
Depreciation and amortization									465.4	491.4	523.2
Capital expenditures									94.5	89.4	80.2
Identifiable assets	7,317.0				7,642.5				7,317.0	7,642.5	8,368.7
Diagnostics [Member]
Segment Reporting Information [Line Items]
Total revenues									1,236.9	1,211.8	1,186.8
Operating income (loss)									126.0	109.5	48.7
Depreciation and amortization									341.8	358.7	376.0
Capital expenditures									53.5	55.6	52.2
Identifiable assets	3,771.9				4,055.8				3,771.9	4,055.8	4,383.5
Breast Health [Member]
Segment Reporting Information [Line Items]
Total revenues									1,112.8	1,063.4	944.7
Operating income (loss)									350.5	296.3	187.6
Depreciation and amortization									22.6	28.6	41.7
Capital expenditures									10.6	12.8	10.0
Identifiable assets	809.1				815.4				809.1	815.4	859.8
GYN Surgical [Member]
Segment Reporting Information [Line Items]
Total revenues									393.1	335.8	307.9
Operating income (loss)									69.1	38.6	30.3
Depreciation and amortization									99.9	102.7	104.6
Capital expenditures									17.7	9.5	8.0
Identifiable assets	1,570.7				1,658.1				1,570.7	1,658.1	1,748.2
Skeletal Health [Member]
Segment Reporting Information [Line Items]
Total revenues									89.9	94.0	91.3
Operating income (loss)									3.0	10.7	13.1
Depreciation and amortization									1.1	1.4	0.9
Capital expenditures									0.4	0.4	0.4
Identifiable assets	30.9				25.3				30.9	25.3	26.1
Corporate [Member]
Segment Reporting Information [Line Items]
Capital expenditures									12.3	11.1	9.6
Identifiable assets	$ 1,134.4				$ 1,087.9				$ 1,134.4	$ 1,087.9	$ 1,351.1

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