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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany $ 232.2 $ 224.7 $ 599.1 $ 585.0  
Operating income 42.6 22.6 67.4 55.1  
Depreciation and amortization 10.2 9.8 31.1 29.3  
Restructuring 1.2 21.2 5.0 22.8  
Payments to Acquire Productive Assets 7.5 5.1 21.6 17.0  
Total assets 1,234.2   1,234.2   $ 1,280.6
Intangible intangible assets, net 442.0   442.0   $ 434.6
Mueller Co. [Member]          
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany 207.6 198.7 535.5 525.6  
Operating income 52.9 51.7 113.3 110.4  
Depreciation and amortization 8.9 8.5 27.0 25.5  
Restructuring 0.4 2.4 2.1 3.0  
Payments to Acquire Productive Assets 6.1 3.6 13.8 12.4  
Mueller Technologies [Member]          
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany 24.6 26.0 63.6 59.4  
Operating income (1.6) (1.5) (17.5) (10.2)  
Depreciation and amortization 1.2 1.2 3.8 3.5  
Restructuring 0.0 0.0 0.1 0.5  
Payments to Acquire Productive Assets 1.3 1.5 7.6 4.5  
Corporate [Member]          
Segment Reporting Information [Line Items]          
Operating income (8.7) (27.6) (28.4) (45.1)  
Depreciation and amortization 0.1 0.1 0.3 0.3  
Restructuring 0.8 18.8 2.8 19.3  
Payments to Acquire Productive Assets $ 0.1 $ 0.0 $ 0.2 $ 0.1