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Intangible Assets and Goodwill - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 25, 2021	Sep. 25, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 5,660.6	$ 5,582.1
Accumulated Amortization	4,010.1	3,922.9
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,656.9	4,597.7
Accumulated Amortization	3,258.4	3,184.2
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	69.4	71.6
Accumulated Amortization	0.0	0.0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	612.6	591.7
Accumulated Amortization	518.1	510.1
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	268.8	268.1
Accumulated Amortization	194.6	191.8
Non-competition agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1.5	1.5
Accumulated Amortization	1.5	1.5
Business licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2.5	2.5
Accumulated Amortization	2.5	2.5
Total acquired intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5,611.7	5,533.1
Accumulated Amortization	3,975.1	3,890.1
Internal-use software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	23.4	23.5
Accumulated Amortization	17.9	17.2
Capitalized software embedded in products
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	25.5	25.5
Accumulated Amortization	$ 17.1	$ 15.6

X

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
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