Summary of Significant Accounting Policies - Rollforward of Goodwill Activity by Reportable Segments (Detail) $ in Millions	12 Months Ended
Sep. 24, 2022 USD ($)
Goodwill [Roll Forward]
Balance at September 25, 2021	$ 3,281.6
Foreign currency and other adjustments	(109.0)
Balance at September 24, 2022	3,236.5
Diagnostics
Goodwill [Roll Forward]
Balance at September 25, 2021	1,410.8
Foreign currency and other adjustments	(92.1)
Balance at September 24, 2022	1,313.8
Breast Health
Goodwill [Roll Forward]
Balance at September 25, 2021	797.1
Foreign currency and other adjustments	(15.3)
Balance at September 24, 2022	781.8
Gyn Surgical [Member]
Goodwill [Roll Forward]
Balance at September 25, 2021	1,065.6
Foreign currency and other adjustments	(1.5)
Balance at September 24, 2022	1,132.9
Skeletal Health
Goodwill [Roll Forward]
Balance at September 25, 2021	8.1
Foreign currency and other adjustments	(0.1)
Balance at September 24, 2022	8.0
Mobidiag Oy
Goodwill [Roll Forward]
Goodwill, Acquired During Period	(4.9)
Mobidiag Oy \| Diagnostics
Goodwill [Roll Forward]
Goodwill, Acquired During Period	(4.9)
Mobidiag Oy \| Breast Health
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0.0
Mobidiag Oy \| Gyn Surgical [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0.0
Mobidiag Oy \| Skeletal Health
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0.0
Bolder Surgical
Goodwill [Roll Forward]
Goodwill, Acquired During Period	(68.8)
Bolder Surgical \| Diagnostics
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0.0
Bolder Surgical \| Breast Health
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0.0
Bolder Surgical \| Gyn Surgical [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	(68.8)
Bolder Surgical \| Skeletal Health
Goodwill [Roll Forward]
Goodwill, Acquired During Period	$ 0.0

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: 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=120320667&loc=SL49117168-202975

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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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.

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