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Segment Information (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]    
Restructuring and other charges $ (3.7) $ 2.4
Operating income 34.0 28.9
Depreciation, Depletion and Amortization 14.8 15.2
Payments to Acquire Productive Assets 9.9 11.0
Net sales 314.8 272.3
Mueller Co. [Member]    
Segment Reporting Information [Line Items]    
Restructuring and other charges 0.0 0.0
Operating income 24.2 31.3
Depreciation, Depletion and Amortization 7.7 7.4
Payments to Acquire Productive Assets 7.8 9.4
Net sales 165.6 154.9
Mueller Co. [Member] | Central Region [Member]    
Segment Reporting Information [Line Items]    
Net sales 44.0 40.5
Mueller Co. [Member] | Northeast Region [Member] [Member]    
Segment Reporting Information [Line Items]    
Net sales 31.3 30.0
Mueller Co. [Member] | Southeast Region [Member]    
Segment Reporting Information [Line Items]    
Net sales 33.4 37.3
Mueller Co. [Member] | Western Region [Member]    
Segment Reporting Information [Line Items]    
Net sales 49.2 38.1
Mueller Co. [Member] | UNITED STATES    
Segment Reporting Information [Line Items]    
Net sales 157.9 145.9
Mueller Co. [Member] | CANADA    
Segment Reporting Information [Line Items]    
Net sales 4.4 7.9
Mueller Co. [Member] | Other International Locations [Member]    
Segment Reporting Information [Line Items]    
Net sales 3.3 1.1
Corporate    
Segment Reporting Information [Line Items]    
Restructuring and other charges (3.7) 2.3
Operating income (9.8) (13.8)
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 (0.1)
Operating income 19.6 11.4
Depreciation, Depletion and Amortization 7.0 7.7
Payments to Acquire Productive Assets 2.1 1.6
Net sales 149.2 117.4
Mueller Technologies [Member] | Central Region [Member]    
Segment Reporting Information [Line Items]    
Net sales 41.5 28.8
Mueller Technologies [Member] | Northeast Region [Member] [Member]    
Segment Reporting Information [Line Items]    
Net sales 31.2 24.3
Mueller Technologies [Member] | Southeast Region [Member]    
Segment Reporting Information [Line Items]    
Net sales 33.3 25.5
Mueller Technologies [Member] | Western Region [Member]    
Segment Reporting Information [Line Items]    
Net sales 29.1 24.7
Mueller Technologies [Member] | UNITED STATES    
Segment Reporting Information [Line Items]    
Net sales 135.1 103.3
Mueller Technologies [Member] | CANADA    
Segment Reporting Information [Line Items]    
Net sales 7.3 7.6
Mueller Technologies [Member] | Other International Locations [Member]    
Segment Reporting Information [Line Items]    
Net sales $ 6.8 $ 6.5