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Goodwill and Intangible Assets (Schedule Of Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Apr. 01, 2022 | Oct. 01, 2021
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (232.6) | $ (155.9)
Total intangible assets, Gross Carrying Amount | 1,798.3 | 1,854.5
Total intangible assets, Net Carrying Amount | $ 1,565.7 | 1,698.6
Customer relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (Years) | 2 years 3 months 18 days |
Finite-Lived Intangible Assets, Gross | $ 154.6 | 174.3
Accumulated Amortization | (79.0) | (44.0)
Net Carrying Amount | $ 75.6 | 130.3
Computer Software, Intangible Asset [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (Years) | 2 years 7 months 6 days |
Finite-Lived Intangible Assets, Gross | $ 61.4 | 48.4
Accumulated Amortization | (32.7) | (23.9)
Net Carrying Amount | 28.7 | 24.5
In Process Research and Development [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | 0.0 | 0.0
Indefinite-lived Intangible Assets (Excluding Goodwill) | $ 427.7 | 594.9
Developed Technology Rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (Years) | 4 years 1 month 6 days |
Finite-Lived Intangible Assets, Gross | $ 1,154.6 | 1,036.9
Accumulated Amortization | (120.9) | (88.0)
Net Carrying Amount | $ 1,033.7 | $ 948.9
Developed Technology Rights | Silicon Labs Industrial and Automotive Business |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (Years) | 6 years 7 months 6 days |

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