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Goodwill and Intangibles - Summary of Definite Lived Intangible Assets (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of Intangible Assets, Finite-lived | $ 0.0 | $ 10.7 |
Document Period End Date | Jun. 30, 2017 |  |
Cost | $ 1,454.5 |  | $ 1,387.7
Accumulated Amortization | (559.2) |  | (488.7)
Net | 895.3 |  | 899.0
Finite-Lived Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Net | 895.3 |  | 899.0
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 1,001.6 |  | 984.8
Accumulated Amortization | (344.3) |  | (302.9)
Net | $ 657.3 |  | 681.9
Customer Relationships [Member] | Weighted Average [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortizable Life | 18 years 5 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 7 months |  |
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 | (100.8) |  | (89.1)
Net | $ 64.9 |  | 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 | $ 287.2 |  | 237.2
Accumulated Amortization | (114.1) |  | (96.7)
Net | $ 173.1 |  | $ 140.5

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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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 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 + 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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- Definition Amount after 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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