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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2023
Segment Reporting Information [Line Items]
Net sales	$ 256.4	$ 314.8
Operating income	22.8	34.0
Depreciation and amortization	16.4	14.8
Restructuring and other charges	6.6	(3.7)
Payments to Acquire Productive Assets	5.7	9.9
Total assets	1,528.8		$ 1,505.0
Intangible intangible assets, net	329.3		$ 334.0
Mueller Co. [Member]
Segment Reporting Information [Line Items]
Net sales	141.3	165.6
Operating income	27.2	24.2
Depreciation and amortization	9.3	7.7
Restructuring and other charges	0.2	0.0
Payments to Acquire Productive Assets	3.9	7.8
Mueller Co. [Member] | Central Region [Member]
Segment Reporting Information [Line Items]
Net sales	38.5	44.0
Mueller Co. [Member] | Northeast Region [Member] [Member]
Segment Reporting Information [Line Items]
Net sales	28.3	31.3
Mueller Co. [Member] | Southeast Region [Member]
Segment Reporting Information [Line Items]
Net sales	37.1	33.4
Mueller Co. [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Net sales	30.6	49.2
Mueller Co. [Member] | CANADA
Segment Reporting Information [Line Items]
Net sales	4.8	4.4
Mueller Co. [Member] | Other International Locations [Member]
Segment Reporting Information [Line Items]
Net sales	2.0	3.3
Mueller Co. [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Net sales	134.5	157.9
Mueller Technologies [Member]
Segment Reporting Information [Line Items]
Net sales	115.1	149.2
Operating income	15.1	19.6
Depreciation and amortization	7.0	7.0
Restructuring and other charges	0.0	0.0
Payments to Acquire Productive Assets	1.8	2.1
Mueller Technologies [Member] | Central Region [Member]
Segment Reporting Information [Line Items]
Net sales	29.2	41.5
Mueller Technologies [Member] | Northeast Region [Member] [Member]
Segment Reporting Information [Line Items]
Net sales	26.8	31.2
Mueller Technologies [Member] | Southeast Region [Member]
Segment Reporting Information [Line Items]
Net sales	28.4	33.3
Mueller Technologies [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Net sales	20.0	29.1
Mueller Technologies [Member] | CANADA
Segment Reporting Information [Line Items]
Net sales	5.7	7.3
Mueller Technologies [Member] | Other International Locations [Member]
Segment Reporting Information [Line Items]
Net sales	5.0	6.8
Mueller Technologies [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Net sales	$ 104.4	$ 135.1

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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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Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Paragraph 32
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Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
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-Paragraph 41
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Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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