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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 356.7 | $ 326.6 | $ 966.5 | $ 974.3
Operating income | 67.0 | 35.6 | 153.3 | 102.5
Depreciation and amortization | 16.3 | 15.8 | 49.2 | 46.1
Restructuring and other charges | 2.9 | 3.9 | 12.7 | 0.9
Payments to Acquire Productive Assets | 12.2 | 11.9 | 28.0 | 32.4
Other Operating Segment | Mueller Co. [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 208.1 | 150.1 | 555.2 | 472.9
Operating income | 57.8 | 12.6 | 137.6 | 52.0
Depreciation and amortization | 9.1 | 8.2 | 28.2 | 23.7
Restructuring and other charges | 0.0 | 0.1 | 0.2 | 0.1
Payments to Acquire Productive Assets | 6.2 | 7.5 | 16.1 | 23.1
Other Operating Segment | Mueller Technologies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 148.6 | 176.5 | 411.3 | 501.4
Operating income | 25.5 | 39.0 | 69.6 | 90.3
Depreciation and amortization | 7.1 | 7.6 | 20.8 | 22.3
Restructuring and other charges | 1.4 | 1.0 | 1.4 | 1.2
Payments to Acquire Productive Assets | 6.0 | 4.4 | 11.9 | 9.3
Other Operating Segment | Central Region [Member] | Mueller Co. [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 55.2 | 43.0 | 148.7 | 131.0
Other Operating Segment | Central Region [Member] | Mueller Technologies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 39.4 | 47.4 | 110.0 | 133.2
Other Operating Segment | Northeast Region [Member] [Member] | Mueller Co. [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 34.4 | 31.7 | 100.1 | 93.4
Other Operating Segment | Northeast Region [Member] [Member] | Mueller Technologies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 31.3 | 44.3 | 90.8 | 116.1
Other Operating Segment | Southeast Region [Member] | Mueller Co. [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 45.2 | 24.8 | 135.5 | 86.8
Other Operating Segment | Southeast Region [Member] | Mueller Technologies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 34.7 | 37.1 | 100.2 | 109.8
Other Operating Segment | Western Region [Member] | Mueller Co. [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 54.9 | 37.8 | 133.8 | 123.4
Other Operating Segment | Western Region [Member] | Mueller Technologies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 28.5 | 31.2 | 72.3 | 93.0
Other Operating Segment | CANADA | Mueller Co. [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 16.1 | 9.8 | 30.2 | 29.2
Other Operating Segment | CANADA | Mueller Technologies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 10.8 | 10.0 | 23.9 | 29.9
Other Operating Segment | Other International Locations [Member] | Mueller Co. [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 2.3 | 3.0 | 6.9 | 9.1
Other Operating Segment | Other International Locations [Member] | Mueller Technologies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 3.9 | 6.5 | 14.1 | 19.4
Other Operating Segment | UNITED STATES | Mueller Co. [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 189.7 | 137.3 | 518.1 | 434.6
Other Operating Segment | UNITED STATES | Mueller Technologies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 133.9 | 160.0 | 373.3 | 452.1
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | (16.3) | (16.0) | (53.9) | (39.8)
Depreciation and amortization | 0.1 | 0.0 | 0.2 | 0.1
Restructuring and other charges | 1.5 | 2.8 | 11.1 | (0.4)
Payments to Acquire Productive Assets | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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