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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2022
Segment Reporting Information [Line Items]      
Net sales $ 314.8 $ 272.3  
Operating income 34.0 28.9  
Depreciation and amortization 14.8 15.2  
Restructuring and other charges (3.7) 2.4  
Payments to Acquire Productive Assets 9.9 11.0  
Total assets 1,486.6   $ 1,498.1
Intangible intangible assets, net 355.6   $ 361.2
Mueller Co. [Member]      
Segment Reporting Information [Line Items]      
Net sales 165.6 154.9  
Operating income 24.2 31.3  
Depreciation and amortization 7.7 7.4  
Restructuring and other charges 0.0 0.0  
Payments to Acquire Productive Assets 7.8 9.4  
Mueller Co. [Member] | Central Region [Member]      
Segment Reporting Information [Line Items]      
Net sales 44.0 40.5  
Mueller Co. [Member] | Northeast Region [Member] [Member]      
Segment Reporting Information [Line Items]      
Net sales 31.3 30.0  
Mueller Co. [Member] | Southeast Region [Member]      
Segment Reporting Information [Line Items]      
Net sales 33.4 37.3  
Mueller Co. [Member] | Western Region [Member]      
Segment Reporting Information [Line Items]      
Net sales 49.2 38.1  
Mueller Co. [Member] | CANADA      
Segment Reporting Information [Line Items]      
Net sales 4.4 7.9  
Mueller Co. [Member] | Other International Locations [Member]      
Segment Reporting Information [Line Items]      
Net sales 3.3 1.1  
Mueller Co. [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Net sales 157.9 145.9  
Mueller Technologies [Member]      
Segment Reporting Information [Line Items]      
Net sales 149.2 117.4  
Operating income 19.6 11.4  
Depreciation and amortization 7.0 7.7  
Restructuring and other charges 0.0 (0.1)  
Payments to Acquire Productive Assets 2.1 1.6  
Mueller Technologies [Member] | Central Region [Member]      
Segment Reporting Information [Line Items]      
Net sales 41.5 28.8  
Mueller Technologies [Member] | Northeast Region [Member] [Member]      
Segment Reporting Information [Line Items]      
Net sales 31.2 24.3  
Mueller Technologies [Member] | Southeast Region [Member]      
Segment Reporting Information [Line Items]      
Net sales 33.3 25.5  
Mueller Technologies [Member] | Western Region [Member]      
Segment Reporting Information [Line Items]      
Net sales 29.1 24.7  
Mueller Technologies [Member] | CANADA      
Segment Reporting Information [Line Items]      
Net sales 7.3 7.6  
Mueller Technologies [Member] | Other International Locations [Member]      
Segment Reporting Information [Line Items]      
Net sales 6.8 6.5  
Mueller Technologies [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Net sales $ 135.1 $ 103.3