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Goodwill and Intangibles - Summary of Definite Lived Intangible Assets (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items] |  |
Document Period End Date | Mar. 31, 2017 |
Cost | $ 1,380.7 | $ 1,387.7
Accumulated Amortization | (532.0) | (488.7)
Net | 848.7 | 899.0
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 976.8 | 984.8
Accumulated Amortization | (327.2) | (302.9)
Net | $ 649.6 | 681.9
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 2 months 6 days |
Technology Assets [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Life | 5 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 | $ 165.7 | 165.7
Accumulated Amortization | (96.9) | (89.1)
Net | $ 68.8 | 76.6
Trade Names [Member] | Weighted Average [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Life | 11 years 4 months 12 days |
Trade Names [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Life | 5 years |
Trade Names [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable Life | 13 years |
Technology-Based Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 238.2 | 237.2
Accumulated Amortization | (107.9) | (96.7)
Net | $ 130.3 | $ 140.5

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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=66006027&loc=d3e16323-109275 + Details
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