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Intangible Assets and Goodwill - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Mar. 27, 2021	Sep. 26, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 5,224.9	$ 4,931.1
Accumulated Amortization	3,777.3	3,623.6
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,320.3	4,054.0
Accumulated Amortization	3,033.9	2,907.2
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	570.9	549.1
Accumulated Amortization	493.9	477.8
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	248.6	245.5
Accumulated Amortization	186.2	181.2
Non-competition agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1.5	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	2.5	2.3
Total acquired intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5,143.8	4,852.5
Accumulated Amortization	3,718.0	3,569.8
Internal-use software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	55.2	51.8
Accumulated Amortization	46.8	43.2
Capitalized software embedded in products
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	25.9	26.8
Accumulated Amortization	$ 12.5	$ 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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