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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Segment Reporting Information [Line Items]          
Net sales $ 326.6 $ 333.2 $ 974.3 $ 916.0  
Operating income 35.6 36.9 102.5 100.0  
Depreciation and amortization 15.8 14.9 46.1 44.9  
Restructuring and other charges 3.9 0.6 0.9 3.6  
Payments to Acquire Productive Assets 11.9 10.7 32.4 36.7  
Total assets 1,493.3   1,493.3   $ 1,498.1
Intangible intangible assets, net 341.9   341.9   $ 361.2
Mueller Co. [Member]          
Segment Reporting Information [Line Items]          
Net sales 150.1 195.9 472.9 534.7  
Operating income 12.6 38.1 52.0 104.8  
Depreciation and amortization 8.2 7.6 23.7 22.5  
Restructuring and other charges 0.1 0.0 0.1 0.0  
Payments to Acquire Productive Assets 7.5 8.1 23.1 29.6  
Mueller Co. [Member] | Central Region [Member]          
Segment Reporting Information [Line Items]          
Net sales 43.0 53.8 131.0 145.0  
Mueller Co. [Member] | Northeast Region [Member] [Member]          
Segment Reporting Information [Line Items]          
Net sales 31.7 29.4 93.4 90.5  
Mueller Co. [Member] | Southeast Region [Member]          
Segment Reporting Information [Line Items]          
Net sales 24.8 44.3 86.8 122.3  
Mueller Co. [Member] | Western Region [Member]          
Segment Reporting Information [Line Items]          
Net sales 37.8 47.4 123.4 131.3  
Mueller Co. [Member] | CANADA          
Segment Reporting Information [Line Items]          
Net sales 9.8 18.8 29.2 40.7  
Mueller Co. [Member] | Other International Locations [Member]          
Segment Reporting Information [Line Items]          
Net sales 3.0 2.2 9.1 4.9  
Mueller Co. [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Net sales 137.3 174.9 434.6 489.1  
Mueller Technologies [Member]          
Segment Reporting Information [Line Items]          
Net sales 176.5 137.3 501.4 381.3  
Operating income 39.0 12.0 90.3 35.1  
Depreciation and amortization 7.6 7.2 22.3 22.2  
Restructuring and other charges 1.0 0.0 1.2 (0.2)  
Payments to Acquire Productive Assets 4.4 2.6 9.3 7.1  
Mueller Technologies [Member] | Central Region [Member]          
Segment Reporting Information [Line Items]          
Net sales 47.4 37.7 133.2 101.1  
Mueller Technologies [Member] | Northeast Region [Member] [Member]          
Segment Reporting Information [Line Items]          
Net sales 44.3 25.4 116.1 78.1  
Mueller Technologies [Member] | Southeast Region [Member]          
Segment Reporting Information [Line Items]          
Net sales 37.1 27.8 109.8 79.6  
Mueller Technologies [Member] | Western Region [Member]          
Segment Reporting Information [Line Items]          
Net sales 31.2 30.8 93.0 77.8  
Mueller Technologies [Member] | CANADA          
Segment Reporting Information [Line Items]          
Net sales 10.0 9.7 29.9 26.0  
Mueller Technologies [Member] | Other International Locations [Member]          
Segment Reporting Information [Line Items]          
Net sales 6.5 5.9 19.4 18.7  
Mueller Technologies [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Net sales $ 160.0 $ 121.7 $ 452.1 $ 336.6