Amount of other income tax expense (benefit).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32672-109319

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_OtherTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Quarterly Statement of Operations Information (Unaudited) - (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 26, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Sep. 29, 2018
Effect of Fourth Quarter Events [Line Items]
Impairment of intangible assets and equipment	$ 241.6	$ 443.8	$ 30.2	$ 4.4	$ 106.7	$ 46.0
Medical Aesthetics Business
Effect of Fourth Quarter Events [Line Items]
Other Tax Expense (Benefit)			$ 312.2