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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Segment Reporting Information [Line Items]
Net sales	$ 310.5	$ 267.5	$ 582.8	$ 504.9
Operating income	34.2	33.4	63.1	61.2
Depreciation and amortization	14.8	14.7	30.0	29.4
Restructuring and other charges	0.6	0.8	3.0	2.2
Payments to Acquire Productive Assets	15.0	15.5	26.0	31.1
Total assets	1,511.5		1,511.5		$ 1,518.0
Intangible intangible assets, net	379.4		379.4		$ 392.5
Mueller Co. [Member]
Segment Reporting Information [Line Items]
Net sales	183.9	147.1	338.8	275.9
Operating income	35.4	29.7	66.7	52.8
Depreciation and amortization	7.5	7.5	14.9	14.9
Restructuring and other charges	0.0	0.0	0.0	0.1
Payments to Acquire Productive Assets	12.1	13.8	21.5	26.1
Mueller Co. [Member] | Central Region [Member]
Segment Reporting Information [Line Items]
Net sales	50.7	38.4	91.2	73.4
Mueller Co. [Member] | Northeast Region [Member] [Member]
Segment Reporting Information [Line Items]
Net sales	31.1	22.4	61.1	47.3
Mueller Co. [Member] | Southeast Region [Member]
Segment Reporting Information [Line Items]
Net sales	40.7	29.9	78.0	53.0
Mueller Co. [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Net sales	45.8	43.4	83.9	79.7
Mueller Co. [Member] | CANADA
Segment Reporting Information [Line Items]
Net sales	14.0	11.1	21.9	16.8
Mueller Co. [Member] | Other International Locations [Member]
Segment Reporting Information [Line Items]
Net sales	1.6	1.9	2.7	5.7
Mueller Co. [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Net sales	168.3	134.1	314.2	253.4
Mueller Technologies [Member]
Segment Reporting Information [Line Items]
Net sales	126.6	120.4	244.0	229.0
Operating income	11.7	18.3	23.2	35.3
Depreciation and amortization	7.3	7.2	15.0	14.4
Restructuring and other charges	0.1	0.7	0.1	0.7
Payments to Acquire Productive Assets	2.9	1.7	4.5	4.9
Mueller Technologies [Member] | Central Region [Member]
Segment Reporting Information [Line Items]
Net sales	34.6	32.3	63.4	59.2
Mueller Technologies [Member] | Northeast Region [Member] [Member]
Segment Reporting Information [Line Items]
Net sales	28.4	24.2	52.7	48.6
Mueller Technologies [Member] | Southeast Region [Member]
Segment Reporting Information [Line Items]
Net sales	26.3	24.7	51.8	47.5
Mueller Technologies [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Net sales	22.3	23.1	47.0	45.2
Mueller Technologies [Member] | CANADA
Segment Reporting Information [Line Items]
Net sales	8.7	9.4	16.3	16.1
Mueller Technologies [Member] | Other International Locations [Member]
Segment Reporting Information [Line Items]
Net sales	6.3	6.7	12.8	12.4
Mueller Technologies [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Net sales	$ 111.6	$ 104.3	$ 214.9	$ 200.5

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