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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 310.5	$ 228.5	$ 815.4	$ 698.8
Operating income	42.7	20.0	103.9	76.1
Depreciation and amortization	15.2	14.5	44.6	42.8
Restructuring and other charges	3.9	8.6	6.1	11.9
Payments to Acquire Productive Assets	15.0	13.9	46.1	51.2
Total assets	1,484.6		1,484.6		$ 1,395.0
Intangible intangible assets, net	402.0		402.0		$ 408.9
Mueller Co. [Member]
Segment Reporting Information [Line Items]
Net sales	287.3	209.4	750.1	641.6
Operating income	64.0	43.6	158.2	129.4
Depreciation and amortization	13.0	12.2	38.2	36.3
Restructuring and other charges	0.2	0.0	(0.4)	0.4
Payments to Acquire Productive Assets	13.8	13.4	43.3	49.1
Mueller Co. [Member] | Central Region [Member]
Segment Reporting Information [Line Items]
Net sales	71.1	57.4	192.1	163.6
Mueller Co. [Member] | Northeast Region [Member] [Member]
Segment Reporting Information [Line Items]
Net sales	52.9	38.7	141.8	135.3
Mueller Co. [Member] | Southeast Region [Member]
Segment Reporting Information [Line Items]
Net sales	57.6	35.6	144.1	119.8
Mueller Co. [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Net sales	71.2	50.7	188.1	154.3
Mueller Co. [Member] | CANADA
Segment Reporting Information [Line Items]
Net sales	27.9	20.7	60.4	47.3
Mueller Co. [Member] | Other International Locations [Member]
Segment Reporting Information [Line Items]
Net sales	6.5	6.3	23.5	21.3
Mueller Co. [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Net sales	252.9	182.4	666.2	573.0
Mueller Technologies [Member]
Segment Reporting Information [Line Items]
Net sales	23.2	19.1	65.3	57.2
Operating income	(2.7)	(3.6)	(8.8)	(10.0)
Depreciation and amortization	2.1	2.3	6.2	6.4
Restructuring and other charges	0.0	0.0	0.0	0.0
Payments to Acquire Productive Assets	1.2	0.5	2.7	1.8
Mueller Technologies [Member] | Central Region [Member]
Segment Reporting Information [Line Items]
Net sales	5.7	5.1	17.3	13.6
Mueller Technologies [Member] | Northeast Region [Member] [Member]
Segment Reporting Information [Line Items]
Net sales	3.0	4.1	10.0	15.0
Mueller Technologies [Member] | Southeast Region [Member]
Segment Reporting Information [Line Items]
Net sales	8.5	5.2	22.3	16.6
Mueller Technologies [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Net sales	4.8	3.7	12.7	8.9
Mueller Technologies [Member] | CANADA
Segment Reporting Information [Line Items]
Net sales	0.5	0.3	0.9	1.2
Mueller Technologies [Member] | Other International Locations [Member]
Segment Reporting Information [Line Items]
Net sales	0.7	0.7	2.3	1.9
Mueller Technologies [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Net sales	$ 22.0	$ 18.1	$ 62.2	$ 54.1

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