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Segment Information (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]    
Restructuring and other charges $ 6.6 $ (3.7)
Operating income 22.8 34.0
Depreciation, Depletion and Amortization 16.4 14.8
Payments to Acquire Productive Assets 5.7 9.9
Net sales 256.4 314.8
Mueller Co. [Member]    
Segment Reporting Information [Line Items]    
Restructuring and other charges 0.2 0.0
Operating income 27.2 24.2
Depreciation, Depletion and Amortization 9.3 7.7
Payments to Acquire Productive Assets 3.9 7.8
Net sales 141.3 165.6
Mueller Co. [Member] | Central Region [Member]    
Segment Reporting Information [Line Items]    
Net sales 38.5 44.0
Mueller Co. [Member] | Northeast Region [Member] [Member]    
Segment Reporting Information [Line Items]    
Net sales 28.3 31.3
Mueller Co. [Member] | Southeast Region [Member]    
Segment Reporting Information [Line Items]    
Net sales 37.1 33.4
Mueller Co. [Member] | Western Region [Member]    
Segment Reporting Information [Line Items]    
Net sales 30.6 49.2
Mueller Co. [Member] | UNITED STATES    
Segment Reporting Information [Line Items]    
Net sales 134.5 157.9
Mueller Co. [Member] | CANADA    
Segment Reporting Information [Line Items]    
Net sales 4.8 4.4
Mueller Co. [Member] | Other International Locations [Member]    
Segment Reporting Information [Line Items]    
Net sales 2.0 3.3
Corporate    
Segment Reporting Information [Line Items]    
Restructuring and other charges 6.4 (3.7)
Operating income (19.5) (9.8)
Depreciation, Depletion and Amortization 0.1 0.1
Payments to Acquire Productive Assets 0.0 0.0
Mueller Technologies [Member]    
Segment Reporting Information [Line Items]    
Restructuring and other charges 0.0 0.0
Operating income 15.1 19.6
Depreciation, Depletion and Amortization 7.0 7.0
Payments to Acquire Productive Assets 1.8 2.1
Net sales 115.1 149.2
Mueller Technologies [Member] | Central Region [Member]    
Segment Reporting Information [Line Items]    
Net sales 29.2 41.5
Mueller Technologies [Member] | Northeast Region [Member] [Member]    
Segment Reporting Information [Line Items]    
Net sales 26.8 31.2
Mueller Technologies [Member] | Southeast Region [Member]    
Segment Reporting Information [Line Items]    
Net sales 28.4 33.3
Mueller Technologies [Member] | Western Region [Member]    
Segment Reporting Information [Line Items]    
Net sales 20.0 29.1
Mueller Technologies [Member] | UNITED STATES    
Segment Reporting Information [Line Items]    
Net sales 104.4 135.1
Mueller Technologies [Member] | CANADA    
Segment Reporting Information [Line Items]    
Net sales 5.7 7.3
Mueller Technologies [Member] | Other International Locations [Member]    
Segment Reporting Information [Line Items]    
Net sales $ 5.0 $ 6.8