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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Segment Reporting Information [Line Items]        
Net sales $ 356.7 $ 326.6 $ 966.5 $ 974.3
Operating income 67.0 35.6 153.3 102.5
Depreciation and amortization 16.3 15.8 49.2 46.1
Restructuring and other charges 2.9 3.9 12.7 0.9
Payments to Acquire Productive Assets 12.2 11.9 28.0 32.4
Other Operating Segment | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 208.1 150.1 555.2 472.9
Operating income 57.8 12.6 137.6 52.0
Depreciation and amortization 9.1 8.2 28.2 23.7
Restructuring and other charges 0.0 0.1 0.2 0.1
Payments to Acquire Productive Assets 6.2 7.5 16.1 23.1
Other Operating Segment | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 148.6 176.5 411.3 501.4
Operating income 25.5 39.0 69.6 90.3
Depreciation and amortization 7.1 7.6 20.8 22.3
Restructuring and other charges 1.4 1.0 1.4 1.2
Payments to Acquire Productive Assets 6.0 4.4 11.9 9.3
Other Operating Segment | Central Region [Member] | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 55.2 43.0 148.7 131.0
Other Operating Segment | Central Region [Member] | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 39.4 47.4 110.0 133.2
Other Operating Segment | Northeast Region [Member] [Member] | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 34.4 31.7 100.1 93.4
Other Operating Segment | Northeast Region [Member] [Member] | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 31.3 44.3 90.8 116.1
Other Operating Segment | Southeast Region [Member] | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 45.2 24.8 135.5 86.8
Other Operating Segment | Southeast Region [Member] | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 34.7 37.1 100.2 109.8
Other Operating Segment | Western Region [Member] | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 54.9 37.8 133.8 123.4
Other Operating Segment | Western Region [Member] | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 28.5 31.2 72.3 93.0
Other Operating Segment | CANADA | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 16.1 9.8 30.2 29.2
Other Operating Segment | CANADA | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 10.8 10.0 23.9 29.9
Other Operating Segment | Other International Locations [Member] | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 2.3 3.0 6.9 9.1
Other Operating Segment | Other International Locations [Member] | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 3.9 6.5 14.1 19.4
Other Operating Segment | UNITED STATES | Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Net sales 189.7 137.3 518.1 434.6
Other Operating Segment | UNITED STATES | Mueller Technologies [Member]        
Segment Reporting Information [Line Items]        
Net sales 133.9 160.0 373.3 452.1
Corporate        
Segment Reporting Information [Line Items]        
Operating income (16.3) (16.0) (53.9) (39.8)
Depreciation and amortization 0.1 0.0 0.2 0.1
Restructuring and other charges 1.5 2.8 11.1 (0.4)
Payments to Acquire Productive Assets $ 0.0 $ 0.0 $ 0.0 $ 0.0