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Goodwill and Intangible Assets (Schedule Of Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 30, 2022 | Sep. 30, 2022
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (417.6) | $ (376.7)
Total intangible assets, Gross Carrying Amount | 1,790.6 | 1,821.4
Total intangible assets, Net Carrying Amount | $ 1,373.0 | 1,444.7
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 | 154.6
Accumulated Amortization | (143.9) | (122.3)
Net Carrying Amount | $ 10.7 | 32.3
Computer Software, Intangible Asset [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (Years) | 2 years 8 months 12 days |
Finite-Lived Intangible Assets, Gross | $ 74.3 | 105.1
Accumulated Amortization | (20.1) | (45.2)
Net Carrying Amount | 54.2 | 59.9
In Process Research and Development [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | 0.0 | 0.0
Indefinite-lived Intangible Assets (Excluding Goodwill) | $ 273.1 | 280.8
Developed Technology Rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (Years) | 6 years |
Finite-Lived Intangible Assets, Gross | $ 1,288.6 | 1,280.9
Accumulated Amortization | (253.6) | (209.2)
Net Carrying Amount | $ 1,035.0 | $ 1,071.7
Developed Technology Rights | Silicon Labs Industrial and Automotive Business |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (Years) | 12 years |

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