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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Segment Reporting Information [Line Items]      
Net sales, excluding intercompany $ 242.7 $ 261.8  
2013 1.6 1.9  
Operating income 14.9 8.1  
Depreciation and amortization 13.0 14.3  
Restructuring 0.8 8.2  
Payments to Acquire Productive Assets 6.3 7.2  
Total assets 1,166.4   $ 1,229.8
Intangible intangible assets, net 501.8   $ 507.3
Mueller Co. [Member]      
Segment Reporting Information [Line Items]      
Net sales, excluding intercompany 144.7 145.1  
2013 1.6 1.9  
Operating income 23.8 12.4  
Depreciation and amortization 8.4 9.7  
Restructuring 0.2 8.1  
Payments to Acquire Productive Assets 3.6 3.4  
Anvil [Member]      
Segment Reporting Information [Line Items]      
Net sales, excluding intercompany 79.6 97.1  
2013 0.0 0.0  
Operating income 3.6 7.2  
Depreciation and amortization 3.4 3.6  
Restructuring 0.1 0.0  
Payments to Acquire Productive Assets 1.6 2.6  
Mueller Technologies [Member]      
Segment Reporting Information [Line Items]      
Net sales, excluding intercompany 18.4 19.6  
2013 0.0 0.0  
Operating income (3.8) (2.9)  
Depreciation and amortization 1.1 0.9  
Restructuring 0.5 0.0  
Payments to Acquire Productive Assets 1.0 1.2  
Corporate [Member]      
Segment Reporting Information [Line Items]      
Operating income (8.7) (8.6)  
Depreciation and amortization 0.1 0.1  
Restructuring 0.0 0.1  
Payments to Acquire Productive Assets $ 0.1 $ 0.0