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Goodwill and Intangibles - Summary of Definite Lived Intangible Assets (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items] |  |
Document Period End Date | Jun. 30, 2016 |
Cost | $ 1,385.7 | $ 1,389.2
Accumulated Amortization | (465.0) | (399.2)
Net | 920.7 | 990.0
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 984.0 | 985.2
Accumulated Amortization | (288.7) | (247.4)
Net | $ 695.3 | 737.8
Customer Relationships [Member] | Weighted Average [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Life | 18 years 6 months |
Customer Relationships [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Life | 2 years |
Customer Relationships [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Life | 20 years |
Technology Assets [Member] | Weighted Average [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Life | 11 years 1 month 6 days |
Technology Assets [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Life | 4 years |
Technology Assets [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Life | 18 years |
Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 165.4 | 165.4
Accumulated Amortization | (85.3) | (73.7)
Net | $ 80.1 | 91.7
Trade Names [Member] | Weighted Average [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Life | 16 years 2 months 12 days |
Trade Names [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Life | 8 years |
Trade Names [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Life | 17 years |
Technology-Based Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 236.3 | 238.6
Accumulated Amortization | (91.0) | (78.1)
Net | $ 145.3 | $ 160.5

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount before 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=26713463&loc=d3e16323-109275 + Details
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