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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]    
Net sales $ 304.3 $ 256.4
Operating income 47.4 22.8
Depreciation and amortization 11.1 16.4
Restructuring and other charges 1.7 6.6
Payments to Acquire Productive Assets 11.9 5.7
Other Operating Segment | Mueller Co. [Member]    
Segment Reporting Information [Line Items]    
Net sales 174.6 141.3
Operating income 35.3 27.2
Depreciation and amortization 6.1 9.3
Restructuring and other charges 0.0 0.2
Payments to Acquire Productive Assets 5.7 3.9
Other Operating Segment | Mueller Technologies [Member]    
Segment Reporting Information [Line Items]    
Net sales 129.7 115.1
Operating income 27.3 15.1
Depreciation and amortization 5.0 7.0
Restructuring and other charges 0.3 0.0
Payments to Acquire Productive Assets 6.2 1.8
Other Operating Segment | Central Region [Member] | Mueller Co. [Member]    
Segment Reporting Information [Line Items]    
Net sales 48.5 38.5
Other Operating Segment | Central Region [Member] | Mueller Technologies [Member]    
Segment Reporting Information [Line Items]    
Net sales 35.1 29.2
Other Operating Segment | Northeast Region [Member] [Member] | Mueller Co. [Member]    
Segment Reporting Information [Line Items]    
Net sales 33.3 28.3
Other Operating Segment | Northeast Region [Member] [Member] | Mueller Technologies [Member]    
Segment Reporting Information [Line Items]    
Net sales 29.2 26.8
Other Operating Segment | Southeast Region [Member] | Mueller Co. [Member]    
Segment Reporting Information [Line Items]    
Net sales 38.6 37.1
Other Operating Segment | Southeast Region [Member] | Mueller Technologies [Member]    
Segment Reporting Information [Line Items]    
Net sales 26.6 28.4
Other Operating Segment | Western Region [Member] | Mueller Co. [Member]    
Segment Reporting Information [Line Items]    
Net sales 43.9 30.6
Other Operating Segment | Western Region [Member] | Mueller Technologies [Member]    
Segment Reporting Information [Line Items]    
Net sales 28.5 20.0
Other Operating Segment | CANADA | Mueller Co. [Member]    
Segment Reporting Information [Line Items]    
Net sales 8.0 4.8
Other Operating Segment | CANADA | Mueller Technologies [Member]    
Segment Reporting Information [Line Items]    
Net sales 4.4 5.7
Other Operating Segment | Other International Locations [Member] | Mueller Co. [Member]    
Segment Reporting Information [Line Items]    
Net sales 2.3 2.0
Other Operating Segment | Other International Locations [Member] | Mueller Technologies [Member]    
Segment Reporting Information [Line Items]    
Net sales 5.9 5.0
Other Operating Segment | UNITED STATES | Mueller Co. [Member]    
Segment Reporting Information [Line Items]    
Net sales 164.3 134.5
Other Operating Segment | UNITED STATES | Mueller Technologies [Member]    
Segment Reporting Information [Line Items]    
Net sales 119.4 104.4
Corporate    
Segment Reporting Information [Line Items]    
Operating income (15.2) (19.5)
Depreciation and amortization 0.0 0.1
Restructuring and other charges 1.4 6.4
Payments to Acquire Productive Assets $ 0.0 $ 0.0