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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales, excluding intercompany | $ 232.2 | $ 224.7 | $ 599.1 | $ 585.0 |
Operating income | 42.6 | 22.6 | 67.4 | 55.1 |
Depreciation and amortization | 10.2 | 9.8 | 31.1 | 29.3 |
Restructuring | 1.2 | 21.2 | 5.0 | 22.8 |
Payments to Acquire Productive Assets | 7.5 | 5.1 | 21.6 | 17.0 |
Total assets | 1,234.2 |  | 1,234.2 |  | $ 1,280.6
Intangible intangible assets, net | 442.0 |  | 442.0 |  | $ 434.6
Mueller Co. [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales, excluding intercompany | 207.6 | 198.7 | 535.5 | 525.6 |
Operating income | 52.9 | 51.7 | 113.3 | 110.4 |
Depreciation and amortization | 8.9 | 8.5 | 27.0 | 25.5 |
Restructuring | 0.4 | 2.4 | 2.1 | 3.0 |
Payments to Acquire Productive Assets | 6.1 | 3.6 | 13.8 | 12.4 |
Mueller Technologies [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales, excluding intercompany | 24.6 | 26.0 | 63.6 | 59.4 |
Operating income | (1.6) | (1.5) | (17.5) | (10.2) |
Depreciation and amortization | 1.2 | 1.2 | 3.8 | 3.5 |
Restructuring | 0.0 | 0.0 | 0.1 | 0.5 |
Payments to Acquire Productive Assets | 1.3 | 1.5 | 7.6 | 4.5 |
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income | (8.7) | (27.6) | (28.4) | (45.1) |
Depreciation and amortization | 0.1 | 0.1 | 0.3 | 0.3 |
Restructuring | 0.8 | 18.8 | 2.8 | 19.3 |
Payments to Acquire Productive Assets | $ 0.1 | $ 0.0 | $ 0.2 | $ 0.1 |

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