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v3.23.3

Segment Information (Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 USD ($) business_segments | Sep. 30, 2022 USD ($) | Sep. 30, 2021
Segment Reporting [Abstract] |  |  |
Number of Reportable Segments | business_segments | 2 |  |
Revenue, Major Customer [Line Items] |  |  |
Receivables, net | $ 217.1 | $ 228.0 |
Intangible Assets, Net (Including Goodwill) | 427.7 | 459.8 |
Total assets | $ 1,505.0 | 1,498.1 |
Document Period End Date | Sep. 30, 2023 |  |
Mueller Co. [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Intangible Assets, Net (Including Goodwill) | $ 283.8 | 302.6 |
Mueller Technologies [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Intangible Assets, Net (Including Goodwill) | $ 143.9 | $ 157.2 |
Customer Concentration Risk [Member] | Ferguson Enterprises | Sales Revenue, Goods, Gross [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
10 largest customers | 18.00% | 20.00% | 19.00%
Customer Concentration Risk [Member] | Core & Main, Inc. | Sales Revenue, Goods, Gross [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
10 largest customers | 18.00% | 21.00% | 18.00%

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