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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]      
Intercompany sales $ 1,247.4 $ 1,111.0 $ 964.1
Operating income 111.6 131.7 116.8
Depreciation and amortization 60.5 59.6 57.8
2016 7.2 8.0 13.0
Capital expenditures (54.7) (62.7) (67.7)
Property, plant and equipment, net 301.6 283.4  
Total assets $ 1,498.1 1,518.0  
Document Period End Date Sep. 30, 2022    
Intangible Assets, Net (Including Goodwill) $ 459.8 507.6  
Mueller Co. [Member]      
Segment Reporting Information [Line Items]      
Intercompany sales 714.1 617.8 532.2
Operating income 118.3 120.9 104.9
Depreciation and amortization 30.0 30.5 28.9
2016 0.2 0.1 0.0
Capital expenditures (43.4) (51.0) (57.3)
Intangible Assets, Net (Including Goodwill) 302.6 324.1  
Mueller Technologies [Member]      
Segment Reporting Information [Line Items]      
Intercompany sales 533.3 493.2 431.9
Operating income 48.7 70.3 68.7
Depreciation and amortization 30.3 28.9 28.7
2016 0.4 (0.4) 0.7
Capital expenditures (11.3) (11.6) (10.1)
Intangible Assets, Net (Including Goodwill) 157.2 183.5  
Corporate [Member]      
Segment Reporting Information [Line Items]      
Intercompany sales 0.0 0.0 0.0
Operating income (55.4) (59.5) (56.8)
Depreciation and amortization 0.2 0.2 0.2
2016 6.6 8.3 12.3
Capital expenditures 0.0 (0.1) $ (0.3)
Intangible Assets, Net (Including Goodwill) $ 0.0 $ 0.0