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Summary of Significant Accounting Policies - Rollforward of Goodwill Activity by Reportable Segments (Detail)	12 Months Ended
	Sep. 28, 2019 USD ($)
Goodwill [Roll Forward]
Balance at September 29, 2018	$ 2,533,200,000
Foreign currency and other adjustments	(4,500,000)
Balance at September 28, 2019	2,563,700,000
Diagnostics
Goodwill [Roll Forward]
Balance at September 29, 2018	821,200,000
Foreign currency and other adjustments	(2,000,000.0)
Balance at September 28, 2019	819,200,000
Breast Health
Goodwill [Roll Forward]
Balance at September 29, 2018	689,500,000
Foreign currency and other adjustments	(2,300,000)
Balance at September 28, 2019	722,200,000
Medical Aesthetics
Goodwill [Roll Forward]
Balance at September 29, 2018	0
Foreign currency and other adjustments	0
Balance at September 28, 2019	0
GYN Surgical
Goodwill [Roll Forward]
Balance at September 29, 2018	1,014,400,000
Foreign currency and other adjustments	(200,000)
Balance at September 28, 2019	1,014,200,000
Skeletal Health
Goodwill [Roll Forward]
Balance at September 29, 2018	8,100,000
Foreign currency and other adjustments	0
Balance at September 28, 2019	8,100,000
Faxitron
Goodwill [Roll Forward]
Faxitron acquisition adjustment	3,900,000
Faxitron | Diagnostics
Goodwill [Roll Forward]
Faxitron acquisition adjustment	0
Faxitron | Breast Health
Goodwill [Roll Forward]
Faxitron acquisition adjustment	3,900,000
Faxitron | Medical Aesthetics
Goodwill [Roll Forward]
Faxitron acquisition adjustment	0
Faxitron | GYN Surgical
Goodwill [Roll Forward]
Faxitron acquisition adjustment	0
Faxitron | Skeletal Health
Goodwill [Roll Forward]
Faxitron acquisition adjustment	0
Focal
Goodwill [Roll Forward]
Faxitron acquisition adjustment	31,100,000
Focal | Diagnostics
Goodwill [Roll Forward]
Faxitron acquisition adjustment	0
Focal | Breast Health
Goodwill [Roll Forward]
Faxitron acquisition adjustment	31,100,000
Focal | Medical Aesthetics
Goodwill [Roll Forward]
Faxitron acquisition adjustment	0
Focal | GYN Surgical
Goodwill [Roll Forward]
Faxitron acquisition adjustment	0
Focal | Skeletal Health
Goodwill [Roll Forward]
Faxitron acquisition adjustment	$ 0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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- Definition

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+ References

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