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Segment Information (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]    
Restructuring and other charges $ 2.4 $ 1.4
Operating income 28.9 27.8
Depreciation, Depletion and Amortization 15.2 14.7
Payments to Acquire Productive Assets 11.0 15.6
Net sales 272.3 237.4
Mueller Co. [Member]    
Segment Reporting Information [Line Items]    
Restructuring and other charges 0.0 0.1
Operating income 31.3 23.1
Depreciation, Depletion and Amortization 7.4 7.4
Payments to Acquire Productive Assets 9.4 12.3
Net sales 154.9 128.8
Mueller Co. [Member] | Central Region [Member]    
Segment Reporting Information [Line Items]    
Net sales 40.5 35.0
Corporate    
Segment Reporting Information [Line Items]    
Restructuring and other charges 2.3 1.3
Operating income (13.8) (12.3)
Depreciation, Depletion and Amortization 0.1 0.1
Payments to Acquire Productive Assets 0.0 0.1
Mueller Technologies [Member]    
Segment Reporting Information [Line Items]    
Restructuring and other charges 0.1 0.0
Operating income 11.4 17.0
Depreciation, Depletion and Amortization 7.7 7.2
Payments to Acquire Productive Assets 1.6 3.2
Net sales 117.4 108.6
Mueller Technologies [Member] | Central Region [Member]    
Segment Reporting Information [Line Items]    
Net sales $ 28.8 $ 26.8