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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, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany $ 283.6 $ 290.3 $ 526.3 $ 552.1  
2013 1.4 1.8 3.0 3.7  
Operating income 29.3 25.6 44.2 33.7  
Depreciation and amortization 13.1 14.4 26.1 28.7  
Restructuring 0.9 0.7 1.7 8.9  
Payments to Acquire Productive Assets 9.0 9.8 15.3 17.0  
Total assets 1,185.1   1,185.1   $ 1,229.8
Intangible intangible assets, net 496.6   496.6   $ 507.3
Mueller Co. [Member]          
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany 182.2 177.3 326.9 322.4  
2013 1.3 1.7 2.9 3.6  
Operating income 34.9 32.4 58.7 44.8  
Depreciation and amortization 8.6 9.7 17.0 19.4  
Restructuring 0.4 0.0 0.6 8.1  
Payments to Acquire Productive Assets 5.2 4.9 8.8 8.3  
Anvil [Member]          
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany 86.4 91.1 166.0 188.2  
2013 0.1 0.1 0.1 0.1  
Operating income 8.0 7.2 11.6 14.4  
Depreciation and amortization 3.2 3.6 6.6 7.2  
Restructuring 0.5 0.2 0.6 0.2  
Payments to Acquire Productive Assets 1.7 3.4 3.3 6.0  
Mueller Technologies [Member]          
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany 15.0 21.9 33.4 41.5  
2013 0.0 0.0 0.0 0.0  
Operating income (4.9) (4.7) (8.7) (7.6)  
Depreciation and amortization 1.2 1.0 2.3 1.9  
Restructuring 0.0 0.1 0.5 0.1  
Payments to Acquire Productive Assets 2.1 1.5 3.1 2.7  
Corporate [Member]          
Segment Reporting Information [Line Items]          
Operating income (8.7) (9.3) (17.4) (17.9)  
Depreciation and amortization 0.1 0.1 0.2 0.2  
Restructuring 0.0 0.4 0.0 0.5  
Payments to Acquire Productive Assets $ 0.0 $ 0.0 $ 0.1 $ 0.0