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Business Segments and Geographic Information - Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Sep. 29, 2018
Segment Reporting Information [Line Items]
Total revenues	$ 852.4	$ 824.0	$ 2,501.4	$ 2,404.5
Income (loss) from operations	145.3	133.1	(37.3)	(336.9)
Depreciation and amortization	113.3	120.5	349.7	361.2
Capital expenditures	25.8	24.7	77.7	73.5
Identifiable assets	6,522.4		6,522.4		$ 7,230.9
Diagnostics
Segment Reporting Information [Line Items]
Total revenues	305.4	294.2	898.6	858.5
Income (loss) from operations	45.7	32.3	120.1	103.1
Depreciation and amortization	61.6	64.6	184.9	193.4
Capital expenditures	14.2	12.8	44.7	38.7
Identifiable assets	2,323.7		2,323.7		2,442.9
Breast Health
Segment Reporting Information [Line Items]
Total revenues	325.4	307.9	971.6	896.0
Income (loss) from operations	97.5	100.0	294.3	291.2
Depreciation and amortization	9.3	5.8	27.5	16.2
Capital expenditures	3.0	4.5	9.7	11.8
Identifiable assets	1,136.8		1,136.8		972.4
Medical Aesthetics
Segment Reporting Information [Line Items]
Total revenues	85.0	91.7	238.6	268.5
Income (loss) from operations	(18.6)	(22.2)	(517.6)	(805.3)
Depreciation and amortization	20.4	26.9	71.0	82.4
Capital expenditures	1.2	1.6	5.7	6.7
Identifiable assets	417.9		417.9		913.3
GYN Surgical
Segment Reporting Information [Line Items]
Total revenues	112.2	107.7	322.8	314.7
Income (loss) from operations	22.5	22.9	70.0	71.1
Depreciation and amortization	21.9	23.0	65.8	68.7
Capital expenditures	4.3	2.5	10.9	8.2
Identifiable assets	1,357.1		1,357.1		1,414.9
Skeletal Health
Segment Reporting Information [Line Items]
Total revenues	24.4	22.5	69.8	66.8
Income (loss) from operations	(1.8)	0.1	(4.1)	3.0
Depreciation and amortization	0.1	0.2	0.5	0.5
Capital expenditures	0.4	1.3	1.0	2.1
Identifiable assets	33.9		33.9		30.3
Corporate
Segment Reporting Information [Line Items]
Capital expenditures	2.7	$ 2.0	5.7	$ 6.0
Identifiable assets	$ 1,253.0		$ 1,253.0		$ 1,457.1

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