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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Segment Reporting Information [Line Items]      
Net sales, excluding intercompany $ 167.2 $ 163.1  
2013 1.1 1.6  
Operating income 13.9 11.4  
Depreciation and amortization 10.3 9.6  
Restructuring 1.3 0.8  
Payments to Acquire Productive Assets 4.2 4.7  
Total assets 1,228.4   $ 1,280.6
Intangible intangible assets, net 429.8   $ 434.6
Mueller Co. [Member]      
Segment Reporting Information [Line Items]      
Net sales, excluding intercompany 146.3 144.7  
2013 1.1 1.6  
Operating income 26.1 23.8  
Depreciation and amortization 9.0 8.4  
Restructuring 0.1 0.2  
Payments to Acquire Productive Assets 3.0 3.6  
Mueller Technologies [Member]      
Segment Reporting Information [Line Items]      
Net sales, excluding intercompany 20.9 18.4  
2013 0.0 0.0  
Operating income (2.2) (3.8)  
Depreciation and amortization 1.2 1.1  
Restructuring 0.0 0.5  
Payments to Acquire Productive Assets 1.1 1.0  
Corporate [Member]      
Segment Reporting Information [Line Items]      
Operating income (10.0) (8.6)  
Depreciation and amortization 0.1 0.1  
Restructuring 1.2 0.1  
Payments to Acquire Productive Assets $ 0.1 $ 0.1