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Goodwill and Intangible Assets (Schedule Of Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Sep. 30, 2022
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Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (518.8) | $ (376.7)
Total intangible assets, Gross Carrying Amount | 1,788.4 | 1,821.4
Total intangible assets, Net Carrying Amount | $ 1,269.6 | 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 | (151.0) | (122.3)
Net Carrying Amount | $ 3.6 | 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 | $ 72.1 | 105.1
Accumulated Amortization | (30.3) | (45.2)
Net Carrying Amount | 41.8 | 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) | $ 271.3 | 280.8
Developed Technology Rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (Years) | 6 years 1 month 6 days |
Finite-Lived Intangible Assets, Gross | $ 1,290.4 | 1,280.9
Accumulated Amortization | (337.5) | (209.2)
Net Carrying Amount | $ 952.9 | $ 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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