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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

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