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Intangible Assets and Goodwill - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 5,530.0	$ 5,562.5
Accumulated Amortization	3,081.0	2,790.2
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,528.8	4,528.7
Accumulated Amortization	2,425.8	2,186.8
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	0.0	46.0
Accumulated Amortization	0.0	0.0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	557.4	552.8
Accumulated Amortization	420.0	393.8
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	310.3	310.3
Accumulated Amortization	170.4	156.4
Distribution agreement
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	42.0	42.0
Accumulated Amortization	6.7	2.8
Non-competition agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1.5	1.5
Accumulated Amortization	0.5	0.1
Business licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2.4	2.4
Accumulated Amortization	2.2	2.2
Total acquired intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5,442.4	5,483.7
Accumulated Amortization	3,025.6	2,742.1
Internal-use software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	69.3	64.5
Accumulated Amortization	51.7	46.1
Capitalized software embedded in products
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	18.3	14.3
Accumulated Amortization	$ 3.7	$ 2.0

X

- Definition

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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

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

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-Name Accounting Standards Codification
-Topic 350
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