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Goodwill and Intangible Assets (Schedule Of Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 26, 2020 | Sep. 27, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Document Period End Date | Jun. 26, 2020 |
Accumulated Amortization | $ (102.5) | $ (74.5)
Total intangible assets, Gross Carrying Amount | 165.4 | 182.4
Total intangible assets, Net Carrying Amount | $ 62.9 | 107.9
Customer relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (Years) | 5 years |
Finite-Lived Intangible Assets, Gross | $ 18.2 | 25.6
Accumulated Amortization | (14.8) | (19.5)
Net Carrying Amount | $ 3.4 | 6.1
Technology-Based Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (Years) | 3 years 9 months 18 days |
Finite-Lived Intangible Assets, Gross | $ 101.0 | 94.4
Accumulated Amortization | (74.5) | (48.9)
Net Carrying Amount | $ 26.5 | 45.5
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 | (1.6) | (1.3)
Net Carrying Amount | 0.0 | 0.3
Computer Software, Intangible Asset [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Accrued Liabilities | $ 11.9 | 20.1
Weighted Average Amortization Period (Years) | 3 years 1 month 6 days |
Finite-Lived Intangible Assets, Gross | $ 25.1 | 24.9
Accumulated Amortization | (11.6) | (4.8)
Net Carrying Amount | $ 13.5 | 20.1
In Process Research and Development [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (Years) | 0 years |
Finite-Lived Intangible Assets, Gross | $ 19.5 | 35.9
Accumulated Amortization | 0.0 | 0.0
Net Carrying Amount | $ 19.5 | $ 35.9

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