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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, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Sep. 30, 2023
Segment Reporting Information [Line Items]
Net sales	$ 353.4	$ 332.9	$ 609.8	$ 647.7
Operating income	63.5	32.9	86.3	66.9
Depreciation and amortization	16.5	15.5	32.9	30.3
Restructuring and other charges	3.2	0.7	9.8	(3.0)
Payments to Acquire Productive Assets	10.1	10.6	15.8	20.5
Total assets	1,539.4		1,539.4		$ 1,505.0
Intangible intangible assets, net	322.3		322.3		$ 334.0
Mueller Co. [Member]
Segment Reporting Information [Line Items]
Net sales	205.8	157.2	347.1	322.8
Operating income	52.6	15.2	79.8	39.4
Depreciation and amortization	9.8	7.8	19.1	15.5
Restructuring and other charges	0.0	0.0	0.2	0.0
Payments to Acquire Productive Assets	6.0	7.8	9.9	15.6
Mueller Co. [Member] | Central Region [Member]
Segment Reporting Information [Line Items]
Net sales	55.0	44.0	93.5	88.0
Mueller Co. [Member] | Northeast Region [Member] [Member]
Segment Reporting Information [Line Items]
Net sales	37.4	30.4	65.7	61.7
Mueller Co. [Member] | Southeast Region [Member]
Segment Reporting Information [Line Items]
Net sales	53.2	28.6	90.3	62.0
Mueller Co. [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Net sales	48.3	36.4	78.9	85.6
Mueller Co. [Member] | CANADA
Segment Reporting Information [Line Items]
Net sales	9.3	15.0	14.1	19.4
Mueller Co. [Member] | Other International Locations [Member]
Segment Reporting Information [Line Items]
Net sales	2.6	2.8	4.6	6.1
Mueller Co. [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Net sales	193.9	139.4	328.4	297.3
Mueller Technologies [Member]
Segment Reporting Information [Line Items]
Net sales	147.6	175.7	262.7	324.9
Operating income	29.0	31.7	44.1	51.3
Depreciation and amortization	6.7	7.7	13.7	14.7
Restructuring and other charges	0.0	0.2	0.0	0.2
Payments to Acquire Productive Assets	4.1	2.8	5.9	4.9
Mueller Technologies [Member] | Central Region [Member]
Segment Reporting Information [Line Items]
Net sales	41.4	44.3	70.6	85.8
Mueller Technologies [Member] | Northeast Region [Member] [Member]
Segment Reporting Information [Line Items]
Net sales	32.7	40.6	59.5	71.8
Mueller Technologies [Member] | Southeast Region [Member]
Segment Reporting Information [Line Items]
Net sales	37.1	39.4	65.5	72.7
Mueller Technologies [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Net sales	23.8	32.7	43.8	61.8
Mueller Technologies [Member] | CANADA
Segment Reporting Information [Line Items]
Net sales	7.4	12.6	13.1	19.9
Mueller Technologies [Member] | Other International Locations [Member]
Segment Reporting Information [Line Items]
Net sales	5.2	6.1	10.2	12.9
Mueller Technologies [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Net sales	$ 135.0	$ 157.0	$ 239.4	$ 292.1

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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