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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021
Segment Reporting Information [Line Items]
Net sales	$ 272.3	$ 237.4
Operating income	28.9	27.8
Depreciation and amortization	15.2	14.7
Restructuring and other charges	2.4	1.4
Payments to Acquire Productive Assets	11.0	15.6
Total assets	1,493.5		$ 1,518.0
Intangible intangible assets, net	386.9		$ 392.5
Mueller Co. [Member]
Segment Reporting Information [Line Items]
Net sales	154.9	128.8
Operating income	31.3	23.1
Depreciation and amortization	7.4	7.4
Restructuring and other charges	0.0	0.1
Payments to Acquire Productive Assets	9.4	12.3
Mueller Co. [Member] | Central Region [Member]
Segment Reporting Information [Line Items]
Net sales	40.5	35.0
Mueller Co. [Member] | Northeast Region [Member] [Member]
Segment Reporting Information [Line Items]
Net sales	30.0	24.9
Mueller Co. [Member] | Southeast Region [Member]
Segment Reporting Information [Line Items]
Net sales	37.3	23.1
Mueller Co. [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Net sales	38.1	36.3
Mueller Co. [Member] | CANADA
Segment Reporting Information [Line Items]
Net sales	7.9	5.7
Mueller Co. [Member] | Other International Locations [Member]
Segment Reporting Information [Line Items]
Net sales	1.1	3.8
Mueller Co. [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Net sales	145.9	119.3
Mueller Technologies [Member]
Segment Reporting Information [Line Items]
Net sales	117.4	108.6
Operating income	11.4	17.0
Depreciation and amortization	7.7	7.2
Restructuring and other charges	0.1	0.0
Payments to Acquire Productive Assets	1.6	3.2
Mueller Technologies [Member] | Central Region [Member]
Segment Reporting Information [Line Items]
Net sales	28.8	26.8
Mueller Technologies [Member] | Northeast Region [Member] [Member]
Segment Reporting Information [Line Items]
Net sales	24.3	24.4
Mueller Technologies [Member] | Southeast Region [Member]
Segment Reporting Information [Line Items]
Net sales	25.5	22.6
Mueller Technologies [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Net sales	24.7	22.1
Mueller Technologies [Member] | CANADA
Segment Reporting Information [Line Items]
Net sales	7.6	6.7
Mueller Technologies [Member] | Other International Locations [Member]
Segment Reporting Information [Line Items]
Net sales	6.5	6.0
Mueller Technologies [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Net sales	$ 103.3	$ 95.9

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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 22: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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Reference 23: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 220
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-Section S99
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