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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Sep. 30, 2013
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany $ 318.5 $ 299.4 $ 864.0 $ 827.6  
2013 1.6 2.2 4.9 5.5  
Operating income 41.8 32.9 81.1 64.1  
Depreciation and amortization 14.0 14.6 42.5 44.4  
Restructuring 0.2 0.2 3.0 1.3  
2013 7.2 9.0 25.5 23.9  
Total assets 1,302.9   1,302.9   1,281.9
Intangible intangible assets, net 532.9   532.9   553.1
Mueller Co. [Member]
          
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany 214.0 199.3 570.3 538.5  
2013 1.6 2.2 4.8 5.4  
Operating income 42.2 30.2 84.3 61.5  
Depreciation and amortization 10.4 10.9 31.6 33.5  
Restructuring 0.2 0.2 1.9 1.2  
2013 5.0 6.6 15.9 15.5  
Anvil [Member]
          
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany 104.5 100.1 293.7 289.1  
2013 0 0 0.1 0.1  
Operating income 9.5 12.3 24.3 27.3  
Depreciation and amortization 3.5 3.6 10.6 10.6  
Restructuring 0 0 1.1 0.1  
2013 2.2 2.3 9.4 8.3  
Corporate [Member]
          
Segment Reporting Information [Line Items]          
Operating income (9.9) (9.6) (27.5) (24.7)  
Depreciation and amortization 0.1 0.1 0.3 0.3  
2013 $ 0 $ 0.1 $ 0.2 $ 0.1