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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, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, excluding intercompany | $ 311.4 | $ 301.0 | $ 290.3 | $ 261.8 | $ 320.7 | $ 318.5 | $ 288.1 | $ 257.4 | $ 1,164.5 | $ 1,184.7 | $ 1,120.8
Operating income | 44.4 | $ 31.5 | $ 25.6 | $ 8.1 | 43.0 | $ 41.8 | $ 25.3 | $ 14.0 | 109.6 | 124.1 | 97.3
Depreciation and amortization |  |  |  |  |  |  |  |  | 58.1 | 56.7 | 59.2
Restructuring |  |  |  |  |  |  |  |  | 20.8 | 3.1 | 1.5
Capital expenditures |  |  |  |  |  |  |  |  | (37.5) | (36.9) | (36.5)
Total assets | 1,229.8 |  |  |  | 1,312.5 |  |  |  | 1,229.8 | 1,312.5 |
Total intangible assets net book value | 507.3 |  |  |  | 533.6 |  |  |  | 507.3 | 533.6 |
Mueller Co. [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, excluding intercompany |  |  |  |  |  |  |  |  | 702.2 | 679.1 | 632.5
Operating income |  |  |  |  |  |  |  |  | 136.9 | 126.7 | 100.3
Depreciation and amortization |  |  |  |  |  |  |  |  | 38.8 | 38.0 | 38.3
Restructuring |  |  |  |  |  |  |  |  | 8.2 | 2.1 | 1.5
Capital expenditures |  |  |  |  |  |  |  |  | (20.5) | (18.8) | (16.6)
Total assets | 757.7 |  |  |  | 767.9 |  |  |  | 757.7 | 767.9 |
Total intangible assets net book value | 435.5 |  |  |  | 459.7 |  |  |  | 435.5 | 459.7 |
Anvil [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, excluding intercompany |  |  |  |  |  |  |  |  | 371.1 | 401.4 | 391.3
Operating income |  |  |  |  |  |  |  |  | 30.0 | 41.3 | 40.2
Depreciation and amortization |  |  |  |  |  |  |  |  | 14.7 | 14.2 | 14.2
Restructuring |  |  |  |  |  |  |  |  | 0.4 | 0.9 | 0.1
Capital expenditures |  |  |  |  |  |  |  |  | (10.3) | (11.6) | (12.3)
Total assets | 255.3 |  |  |  | 263.9 |  |  |  | 255.3 | 263.9 |
Total intangible assets net book value | 54.5 |  |  |  | 57.9 |  |  |  | 54.5 | 57.9 |
Mueller Technologies [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, excluding intercompany |  |  |  |  |  |  |  |  | 91.2 | 104.2 | 97.0
Operating income |  |  |  |  |  |  |  |  | (12.9) | (4.4) | (9.0)
Depreciation and amortization |  |  |  |  |  |  |  |  | 4.2 | 4.1 | 6.3
Restructuring |  |  |  |  |  |  |  |  | 0.1 | 0.1 | 0.0
Capital expenditures |  |  |  |  |  |  |  |  | (6.5) | (6.1) | (7.4)
Total assets | 77.2 |  |  |  | 67.9 |  |  |  | 77.2 | 67.9 |
Total intangible assets net book value | 17.3 |  |  |  | 16.0 |  |  |  | 17.3 | 16.0 |
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales, excluding intercompany |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Operating income |  |  |  |  |  |  |  |  | (44.4) | (39.5) | (34.2)
Depreciation and amortization |  |  |  |  |  |  |  |  | 0.4 | 0.4 | 0.4
Restructuring |  |  |  |  |  |  |  |  | 12.1 | 0.0 | (0.1)
Capital expenditures |  |  |  |  |  |  |  |  | (0.2) | (0.4) | (0.2)
Total assets | 139.6 |  |  |  | 212.8 |  |  |  | 139.6 | 212.8 |
Total intangible assets net book value | $ 0.0 |  |  |  | $ 0.0 |  |  |  | 0.0 | 0.0 |
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intercompany sales |  |  |  |  |  |  |  |  | 7.3 | 6.8 | 7.5
Intersegment Eliminations [Member] | Mueller Co. [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intercompany sales |  |  |  |  |  |  |  |  | 7.2 | 6.7 | 7.4
Intersegment Eliminations [Member] | Anvil [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intercompany sales |  |  |  |  |  |  |  |  | 0.1 | 0.1 | 0.1
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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