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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales, excluding intercompany | $ 199.7 | $ 197.2 | $ 366.9 | $ 360.3 |
Operating income | 10.9 | 21.1 | 24.8 | 32.5 |
Depreciation and amortization | 10.6 | 9.9 | 20.9 | 19.5 |
Restructuring | 2.5 | 0.8 | 3.8 | 1.6 |
Payments to Acquire Productive Assets | 9.9 | 7.2 | 14.1 | 11.9 |
Total assets | 1,209.4 |  | 1,209.4 |  | $ 1,280.6
Intangible intangible assets, net | 447.0 |  | 447.0 |  | $ 434.6
Mueller Co. [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales, excluding intercompany | 181.6 | 182.2 | 327.9 | 326.9 |
Operating income | 34.3 | 34.9 | 60.4 | 58.7 |
Depreciation and amortization | 9.1 | 8.6 | 18.1 | 17.0 |
Restructuring | 1.6 | 0.4 | 1.7 | 0.6 |
Payments to Acquire Productive Assets | 4.7 | 5.2 | 7.7 | 8.8 |
Mueller Technologies [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales, excluding intercompany | 18.1 | 15.0 | 39.0 | 33.4 |
Operating income | (13.7) | (4.9) | (15.9) | (8.7) |
Depreciation and amortization | 1.4 | 1.2 | 2.6 | 2.3 |
Restructuring | 0.1 | 0.0 | 0.1 | 0.5 |
Payments to Acquire Productive Assets | 5.2 | 2.0 | 6.3 | 3.0 |
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income | (9.7) | (8.9) | (19.7) | (17.5) |
Depreciation and amortization | 0.1 | 0.1 | 0.2 | 0.2 |
Restructuring | 0.8 | 0.4 | 2.0 | 0.5 |
Payments to Acquire Productive Assets | $ 0.0 | $ 0.0 | $ 0.1 | $ 0.1 |

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