Business Segments and Geographic Information - Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended
Dec. 26, 2015	Dec. 27, 2014	Sep. 26, 2015
Segment Reporting Information [Line Items]
Total revenues	$ 695.2	$ 652.8
Operating income (loss)	126.1	103.5
Depreciation and amortization	115.9	122.0
Capital expenditures	19.7	21.1
Identifiable assets	7,679.5		$ 7,670.1
Diagnostics
Segment Reporting Information [Line Items]
Total revenues	310.7	304.1
Operating income (loss)	31.6	28.2
Depreciation and amortization	83.7	88.6
Capital expenditures	11.9	14.8
Identifiable assets	3,979.1		4,055.8
Breast Health
Segment Reporting Information [Line Items]
Total revenues	262.2	242.0
Operating income (loss)	71.6	60.6
Depreciation and amortization	7.3	7.6
Capital expenditures	2.0	2.6
Identifiable assets	815.3		815.4
GYN Surgical
Segment Reporting Information [Line Items]
Total revenues	98.8	84.4
Operating income (loss)	20.8	13.1
Depreciation and amortization	24.6	25.6
Capital expenditures	3.4	2.0
Identifiable assets	1,634.3		1,658.1
Skeletal Health
Segment Reporting Information [Line Items]
Total revenues	23.5	22.3
Operating income (loss)	2.1	1.6
Depreciation and amortization	0.3	0.2
Capital expenditures	0.1	0.2
Identifiable assets	27.3		25.3
Corporate
Segment Reporting Information [Line Items]
Capital expenditures	2.3	$ 1.5
Identifiable assets	$ 1,223.5		$ 1,115.5

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.18)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 12
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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