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Intangible Assets and Goodwill - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 26, 2020	Sep. 26, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 4,943.9	$ 4,931.1
Accumulated Amortization	3,699.1	3,623.6
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,056.1	4,054.0
Accumulated Amortization	2,969.4	2,907.2
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	560.5	549.1
Accumulated Amortization	486.7	477.8
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	245.7	245.5
Accumulated Amortization	183.8	181.2
Non-competition agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1.6	1.5
Accumulated Amortization	1.5	1.3
Business licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2.5	2.4
Accumulated Amortization	2.4	2.3
Total acquired intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,866.4	4,852.5
Accumulated Amortization	3,643.8	3,569.8
Internal-use software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	51.9	51.8
Accumulated Amortization	43.8	43.2
Capitalized software embedded in products
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	25.6	26.8
Accumulated Amortization	$ 11.5	$ 10.6

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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
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