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Goodwill and Intangible Assets (Schedule Of Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 29, 2019 | Sep. 28, 2018
Finite-Lived Intangible Assets [Line Items] |  |
Total intangible assets, Gross Carrying Amount | $ 200.1 | $ 187.2
Total intangible assets, Accumulated Amortization | (70.2) | (43.5)
Total intangible assets, Net Carrying Amount | $ 129.9 | 143.7
Customer relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (Years) | 3 years 5 months 9 days |
Finite-Lived Intangible Assets, Gross | $ 31.7 | 31.7
Accumulated Amortization | (20.9) | (13.2)
Net Carrying Amount | $ 10.8 | 18.5
Developed technology and other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (Years) | 4 years 3 months 26 days |
Finite-Lived Intangible Assets, Gross | $ 89.9 | 89.9
Accumulated Amortization | (38.1) | (23.5)
Net Carrying Amount | $ 51.8 | 66.4
Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (Years) | 3 years |
Finite-Lived Intangible Assets, Gross | $ 1.6 | 1.6
Accumulated Amortization | (1.0) | (0.8)
Net Carrying Amount | $ 0.6 | 0.8
Computer Software, Intangible Asset [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (Years) | 2 years 10 months 6 days |
Finite-Lived Intangible Assets, Gross | $ 30.9 | 18.0
Accumulated Amortization | (10.2) | (6.0)
Net Carrying Amount | $ 20.7 | 12.0
In Process Research and Development [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (Years) | 0 years |
Finite-Lived Intangible Assets, Gross | $ 46.0 | 46.0
Accumulated Amortization | 0.0 | 0.0
Net Carrying Amount | $ 46.0 | $ 46.0

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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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