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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, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]        
Net sales $ 364.3 $ 353.4 $ 668.6 $ 609.8
Operating income 69.9 63.5 117.3 86.3
Depreciation and amortization 11.3 16.5 22.4 32.9
Restructuring and other charges 2.4 3.2 4.1 9.8
Payments to Acquire Productive Assets 9.2 10.1 21.1 15.8
Other Operating Segment | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 216.2 205.8 390.8 347.1
Operating income 54.1 52.6 89.4 79.8
Depreciation and amortization 6.3 9.8 12.4 19.1
Restructuring and other charges 1.0 0.0 1.0 0.2
Payments to Acquire Productive Assets 4.8 6.0 10.5 9.9
Other Operating Segment | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 148.1 147.6 277.8 262.7
Operating income 31.3 29.0 58.6 44.1
Depreciation and amortization 5.0 6.7 10.0 13.7
Restructuring and other charges 0.1 0.0 0.4 0.0
Payments to Acquire Productive Assets 4.4 4.1 10.6 5.9
Other Operating Segment | Central Region [Member] | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 58.1 55.0 106.6 93.5
Other Operating Segment | Central Region [Member] | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 40.1 41.4 75.2 70.6
Other Operating Segment | Northeast Region [Member] [Member] | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 40.7 37.4 74.0 65.7
Other Operating Segment | Northeast Region [Member] [Member] | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 28.1 32.7 57.3 59.5
Other Operating Segment | Southeast Region [Member] | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 50.4 53.2 89.0 90.3
Other Operating Segment | Southeast Region [Member] | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 33.9 37.1 60.5 65.5
Other Operating Segment | Western Region [Member] | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 50.9 48.3 94.8 78.9
Other Operating Segment | Western Region [Member] | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 29.3 23.8 57.8 43.8
Other Operating Segment | CANADA | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 12.6 9.3 20.6 14.1
Other Operating Segment | CANADA | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 9.2 7.4 13.6 13.1
Other Operating Segment | Other International Locations [Member] | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 3.5 2.6 5.8 4.6
Other Operating Segment | Other International Locations [Member] | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 7.5 5.2 13.4 10.2
Other Operating Segment | UNITED STATES | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 200.1 193.9 364.4 328.4
Other Operating Segment | UNITED STATES | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 131.4 135.0 250.8 239.4
Corporate        
Segment Reporting Information [Line Items]        
Operating income (15.5) (18.1) (30.7) (37.6)
Depreciation and amortization 0.0 0.0 0.0 0.1
Restructuring and other charges 1.3 3.2 2.7 9.6
Payments to Acquire Productive Assets $ 0.0 $ 0.0 $ 0.0 $ 0.0