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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]      
Intercompany sales $ 1,314.7 $ 1,275.7 $ 1,247.4
Operating income 181.7 127.4 111.6
Depreciation and amortization 66.2 62.5 60.5
Strategic reorganization and other charges 15.8 10.2 7.2
Capital expenditures 47.4 47.6 54.7
Intangible assets, net and goodwill 390.4 427.7  
Inventories, net 301.7 297.9  
Mueller Co. [Member]      
Segment Reporting Information [Line Items]      
Intercompany sales 755.5 634.4 714.1
Operating income 179.2 79.6 118.3
Depreciation and amortization 38.3 32.8 30.0
Strategic reorganization and other charges 0.2 0.0 0.2
Capital expenditures 31.1 33.4 43.4
Intangible assets, net and goodwill 264.9 283.8  
Inventories, net 187.3 173.8  
Mueller Technologies [Member]      
Segment Reporting Information [Line Items]      
Intercompany sales 559.2 641.3 533.3
Operating income 74.0 106.0 48.7
Depreciation and amortization 27.7 29.5 30.3
Strategic reorganization and other charges 1.8 1.7 0.4
Capital expenditures 16.3 14.2 11.3
Intangible assets, net and goodwill 125.5 143.9  
Inventories, net 114.4 124.1  
Corporate [Member]      
Segment Reporting Information [Line Items]      
Intercompany sales 0.0 0.0 0.0
Operating income (71.5) (58.2) (55.4)
Depreciation and amortization 0.2 0.2 0.2
Strategic reorganization and other charges 13.8 8.5 6.6
Capital expenditures 0.0 0.0 $ 0.0
Intangible assets, net and goodwill 0.0 0.0  
Inventories, net $ 0.0 $ 0.0