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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Segment Reporting Information [Line Items] |  |
Net sales | $ 304.3 | $ 256.4
Operating income | 47.4 | 22.8
Depreciation and amortization | 11.1 | 16.4
Restructuring and other charges | 1.7 | 6.6
Payments to Acquire Productive Assets | 11.9 | 5.7
Other Operating Segment | Mueller Co. [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 174.6 | 141.3
Operating income | 35.3 | 27.2
Depreciation and amortization | 6.1 | 9.3
Restructuring and other charges | 0.0 | 0.2
Payments to Acquire Productive Assets | 5.7 | 3.9
Other Operating Segment | Mueller Technologies [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 129.7 | 115.1
Operating income | 27.3 | 15.1
Depreciation and amortization | 5.0 | 7.0
Restructuring and other charges | 0.3 | 0.0
Payments to Acquire Productive Assets | 6.2 | 1.8
Other Operating Segment | Central Region [Member] | Mueller Co. [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 48.5 | 38.5
Other Operating Segment | Central Region [Member] | Mueller Technologies [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 35.1 | 29.2
Other Operating Segment | Northeast Region [Member] [Member] | Mueller Co. [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 33.3 | 28.3
Other Operating Segment | Northeast Region [Member] [Member] | Mueller Technologies [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 29.2 | 26.8
Other Operating Segment | Southeast Region [Member] | Mueller Co. [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 38.6 | 37.1
Other Operating Segment | Southeast Region [Member] | Mueller Technologies [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 26.6 | 28.4
Other Operating Segment | Western Region [Member] | Mueller Co. [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 43.9 | 30.6
Other Operating Segment | Western Region [Member] | Mueller Technologies [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 28.5 | 20.0
Other Operating Segment | CANADA | Mueller Co. [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 8.0 | 4.8
Other Operating Segment | CANADA | Mueller Technologies [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 4.4 | 5.7
Other Operating Segment | Other International Locations [Member] | Mueller Co. [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 2.3 | 2.0
Other Operating Segment | Other International Locations [Member] | Mueller Technologies [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 5.9 | 5.0
Other Operating Segment | UNITED STATES | Mueller Co. [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 164.3 | 134.5
Other Operating Segment | UNITED STATES | Mueller Technologies [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 119.4 | 104.4
Corporate |  |
Segment Reporting Information [Line Items] |  |
Operating income | (15.2) | (19.5)
Depreciation and amortization | 0.0 | 0.1
Restructuring and other charges | 1.4 | 6.4
Payments to Acquire Productive Assets | $ 0.0 | $ 0.0

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