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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, excluding intercompany | $ 226.9 | $ 232.2 | $ 199.7 | $ 167.2 | $ 215.6 | $ 224.7 | $ 197.2 | $ 163.1 | $ 826.0 | $ 800.6 | $ 793.4
Operating income | 33.3 | $ 42.6 | $ 10.9 | $ 13.9 | 37.8 | $ 22.6 | $ 21.1 | $ 11.4 | 100.7 | 92.9 | 79.6
Depreciation and amortization |  |  |  |  |  |  |  |  | 41.9 | 39.5 | 43.4
2016 |  |  |  |  |  |  |  |  | 10.4 | 23.8 | 20.0
Capital expenditures |  |  |  |  |  |  |  |  | (40.6) | (31.5) | (27.2)
Property, plant and equipment, net | 122.3 |  |  |  | 108.4 |  |  |  | 122.3 | 108.4 |
Total assets | 1,258.3 |  |  |  | 1,280.6 |  |  |  | $ 1,258.3 | 1,280.6 |
Document Period End Date |  |  |  |  |  |  |  |  | Sep. 30, 2017 |  |
Intangible Assets, Net (Including Goodwill) | 439.3 |  |  |  | 434.6 |  |  |  | $ 439.3 | 434.6 |
Mueller Co. [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, excluding intercompany |  |  |  |  |  |  |  |  | 739.9 | 715.7 | 702.2
Operating income |  |  |  |  |  |  |  |  | 163.4 | 159.3 | 136.9
Depreciation and amortization |  |  |  |  |  |  |  |  | 36.3 | 34.2 | 38.8
2016 |  |  |  |  |  |  |  |  | 2.7 | 3.0 | 8.4
Capital expenditures |  |  |  |  |  |  |  |  | (28.5) | (24.3) | (20.5)
Total assets | 792.6 |  |  |  | 750.4 |  |  |  | 792.6 | 750.4 |
Intangible Assets, Net (Including Goodwill) | 417.2 |  |  |  | 416.9 |  |  |  | 417.2 | 416.9 |
Mueller Technologies [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, excluding intercompany |  |  |  |  |  |  |  |  | 86.1 | 84.9 | 91.2
Operating income |  |  |  |  |  |  |  |  | (20.3) | (11.1) | (12.9)
Depreciation and amortization |  |  |  |  |  |  |  |  | 5.2 | 4.8 | 4.2
2016 |  |  |  |  |  |  |  |  | 0.7 | 0.9 | 0.1
Capital expenditures |  |  |  |  |  |  |  |  | (11.4) | (7.0) | (6.5)
Total assets | 88.4 |  |  |  | 86.1 |  |  |  | 88.4 | 86.1 |
Intangible Assets, Net (Including Goodwill) | 22.1 |  |  |  | 17.7 |  |  |  | 22.1 | 17.7 |
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, excluding intercompany |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Operating income |  |  |  |  |  |  |  |  | (42.4) | (55.3) | (44.4)
Depreciation and amortization |  |  |  |  |  |  |  |  | 0.4 | 0.5 | 0.4
2016 |  |  |  |  |  |  |  |  | 7.0 | 19.9 | 11.5
Capital expenditures |  |  |  |  |  |  |  |  | (0.7) | (0.2) | (0.2)
Total assets | 377.3 |  |  |  | 444.1 |  |  |  | 377.3 | 444.1 |
Intangible Assets, Net (Including Goodwill) | $ 0.0 |  |  |  | $ 0.0 |  |  |  | 0.0 | 0.0 |
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intercompany sales |  |  |  |  |  |  |  |  | 1.1 | 5.8 | 7.2
Intersegment Eliminations [Member] | Mueller Co. [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intercompany sales |  |  |  |  |  |  |  |  | 1.1 | 5.8 | 7.2
Intersegment Eliminations [Member] | Mueller Technologies [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intercompany sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Intersegment Eliminations [Member] | Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intercompany sales |  |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 0.0

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