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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany $ 250.2 $ 232.2 $ 661.7 $ 599.1  
2013 0.0 0.0 0.0 1.1  
Operating income 30.6 43.0 81.2 68.5  
Depreciation and amortization 10.8 10.2 32.3 31.1  
Restructuring 2.6 1.2 8.4 5.0  
Payments to Acquire Productive Assets 12.5 7.5 26.9 21.6  
Total assets 1,233.3   1,233.3   $ 1,258.3
Intangible intangible assets, net 424.6   424.6   $ 439.3
Mueller Co. [Member]          
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany 224.1 207.6 595.3 535.5  
2013 0.0 0.0 0.0 1.1  
Operating income 57.0 53.0 130.0 113.6  
Depreciation and amortization 9.2 8.9 27.7 27.0  
Restructuring 0.0 0.4 0.1 2.1  
Payments to Acquire Productive Assets 10.7 6.1 21.8 13.8  
Mueller Technologies [Member]          
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany 26.1 24.6 66.4 63.6  
2013 0.0 0.0 0.0 0.0  
Operating income (16.1) (1.6) (24.7) (17.5)  
Depreciation and amortization 1.5 1.2 4.4 3.8  
Restructuring 0.0 0.0 0.1 0.1  
Payments to Acquire Productive Assets 2.0 1.3 5.0 7.6  
Corporate [Member]          
Segment Reporting Information [Line Items]          
Operating income (10.3) (8.4) (24.1) (27.6)  
Depreciation and amortization 0.1 0.1 0.2 0.3  
Restructuring 2.6 0.8 8.2 2.8  
Payments to Acquire Productive Assets $ (0.2) $ 0.1 $ 0.1 $ 0.2