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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Net sales $ 380.3 $ 356.7 $ 1,048.9 $ 966.5
Operating income 73.7 67.0 191.0 153.3
Depreciation and amortization 11.7 16.3 34.1 49.2
Restructuring and other charges 1.0 2.9 5.1 12.7
Payments to Acquire Productive Assets 11.7 12.2 32.8 28.0
Other Operating Segment | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 216.6 208.1 607.4 555.2
Operating income 60.5 57.8 149.9 137.6
Depreciation and amortization 6.6 9.1 19.0 28.2
Restructuring and other charges 0.0 0.0 1.0 0.2
Payments to Acquire Productive Assets 5.3 6.2 15.8 16.1
Other Operating Segment | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 163.7 148.6 441.5 411.3
Operating income 30.1 25.5 88.7 69.6
Depreciation and amortization 5.0 7.1 15.0 20.8
Restructuring and other charges 0.2 1.4 0.6 1.4
Payments to Acquire Productive Assets 6.4 6.0 17.0 11.9
Other Operating Segment | Central Region [Member] | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 56.9 55.2 163.5 148.7
Other Operating Segment | Central Region [Member] | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 40.3 39.4 115.5 110.0
Other Operating Segment | Northeast Region [Member] [Member] | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 38.1 34.4 112.1 100.1
Other Operating Segment | Northeast Region [Member] [Member] | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 31.0 31.3 88.3 90.8
Other Operating Segment | Southeast Region [Member] | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 48.4 45.2 137.4 135.5
Other Operating Segment | Southeast Region [Member] | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 38.5 34.7 99.0 100.2
Other Operating Segment | Western Region [Member] | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 57.4 54.9 152.2 133.8
Other Operating Segment | Western Region [Member] | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 35.7 28.5 93.5 72.3
Other Operating Segment | CANADA | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 13.5 16.1 34.1 30.2
Other Operating Segment | CANADA | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 10.9 10.8 24.5 23.9
Other Operating Segment | Other International Locations [Member] | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 2.3 2.3 8.1 6.9
Other Operating Segment | Other International Locations [Member] | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 7.3 3.9 20.7 14.1
Other Operating Segment | UNITED STATES | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 200.8 189.7 565.2 518.1
Other Operating Segment | UNITED STATES | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 145.5 133.9 396.3 373.3
Corporate        
Segment Reporting Information [Line Items]        
Operating income (16.9) (16.3) (47.6) (53.9)
Depreciation and amortization 0.1 0.1 0.1 0.2
Restructuring and other charges 0.8 1.5 3.5 11.1
Payments to Acquire Productive Assets $ 0.0 $ 0.0 $ 0.0 $ 0.0