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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales, excluding intercompany | $ 250.2 | $ 232.2 | $ 661.7 | $ 599.1 |
2013 | 0.0 | 0.0 | 0.0 | 1.1 |
Operating income | 30.6 | 43.0 | 81.2 | 68.5 |
Depreciation and amortization | 10.8 | 10.2 | 32.3 | 31.1 |
Restructuring | 2.6 | 1.2 | 8.4 | 5.0 |
Payments to Acquire Productive Assets | 12.5 | 7.5 | 26.9 | 21.6 |
Total assets | 1,233.3 |  | 1,233.3 |  | $ 1,258.3
Intangible intangible assets, net | 424.6 |  | 424.6 |  | $ 439.3
Mueller Co. [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales, excluding intercompany | 224.1 | 207.6 | 595.3 | 535.5 |
2013 | 0.0 | 0.0 | 0.0 | 1.1 |
Operating income | 57.0 | 53.0 | 130.0 | 113.6 |
Depreciation and amortization | 9.2 | 8.9 | 27.7 | 27.0 |
Restructuring | 0.0 | 0.4 | 0.1 | 2.1 |
Payments to Acquire Productive Assets | 10.7 | 6.1 | 21.8 | 13.8 |
Mueller Technologies [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales, excluding intercompany | 26.1 | 24.6 | 66.4 | 63.6 |
2013 | 0.0 | 0.0 | 0.0 | 0.0 |
Operating income | (16.1) | (1.6) | (24.7) | (17.5) |
Depreciation and amortization | 1.5 | 1.2 | 4.4 | 3.8 |
Restructuring | 0.0 | 0.0 | 0.1 | 0.1 |
Payments to Acquire Productive Assets | 2.0 | 1.3 | 5.0 | 7.6 |
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income | (10.3) | (8.4) | (24.1) | (27.6) |
Depreciation and amortization | 0.1 | 0.1 | 0.2 | 0.3 |
Restructuring | 2.6 | 0.8 | 8.2 | 2.8 |
Payments to Acquire Productive Assets | $ (0.2) | $ 0.1 | $ 0.1 | $ 0.2 |

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