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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, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany $ 199.7 $ 197.2 $ 366.9 $ 360.3  
Operating income 10.9 21.1 24.8 32.5  
Depreciation and amortization 10.6 9.9 20.9 19.5  
Restructuring 2.5 0.8 3.8 1.6  
Payments to Acquire Productive Assets 9.9 7.2 14.1 11.9  
Total assets 1,209.4   1,209.4   $ 1,280.6
Intangible intangible assets, net 447.0   447.0   $ 434.6
Mueller Co. [Member]          
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany 181.6 182.2 327.9 326.9  
Operating income 34.3 34.9 60.4 58.7  
Depreciation and amortization 9.1 8.6 18.1 17.0  
Restructuring 1.6 0.4 1.7 0.6  
Payments to Acquire Productive Assets 4.7 5.2 7.7 8.8  
Mueller Technologies [Member]          
Segment Reporting Information [Line Items]          
Net sales, excluding intercompany 18.1 15.0 39.0 33.4  
Operating income (13.7) (4.9) (15.9) (8.7)  
Depreciation and amortization 1.4 1.2 2.6 2.3  
Restructuring 0.1 0.0 0.1 0.5  
Payments to Acquire Productive Assets 5.2 2.0 6.3 3.0  
Corporate [Member]          
Segment Reporting Information [Line Items]          
Operating income (9.7) (8.9) (19.7) (17.5)  
Depreciation and amortization 0.1 0.1 0.2 0.2  
Restructuring 0.8 0.4 2.0 0.5  
Payments to Acquire Productive Assets $ 0.0 $ 0.0 $ 0.1 $ 0.1