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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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2021
Segment Reporting Information [Line Items]
Net sales	$ 333.2	$ 310.5	$ 916.0	$ 815.4
Operating income	36.9	42.7	100.0	103.9
Depreciation and amortization	14.9	15.2	44.9	44.6
Restructuring and other charges	0.6	3.9	3.6	6.1
Payments to Acquire Productive Assets	10.7	15.0	36.7	46.1
Total assets	1,509.6		1,509.6		$ 1,518.0
Intangible intangible assets, net	369.4		369.4		$ 392.5
Mueller Co. [Member]
Segment Reporting Information [Line Items]
Net sales	195.9	177.0	534.7	452.9
Operating income	38.1	40.2	104.8	93.0
Depreciation and amortization	7.6	7.9	22.5	22.8
Restructuring and other charges	0.0	0.0	0.0	0.1
Payments to Acquire Productive Assets	8.1	11.5	29.6	37.6
Mueller Co. [Member] | Central Region [Member]
Segment Reporting Information [Line Items]
Net sales	53.8	44.2	145.0	117.6
Mueller Co. [Member] | Northeast Region [Member] [Member]
Segment Reporting Information [Line Items]
Net sales	29.4	31.7	90.5	79.0
Mueller Co. [Member] | Southeast Region [Member]
Segment Reporting Information [Line Items]
Net sales	44.3	37.3	122.3	90.3
Mueller Co. [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Net sales	47.4	47.9	131.3	127.6
Mueller Co. [Member] | CANADA
Segment Reporting Information [Line Items]
Net sales	18.8	14.9	40.7	31.7
Mueller Co. [Member] | Other International Locations [Member]
Segment Reporting Information [Line Items]
Net sales	2.2	1.0	4.9	6.7
Mueller Co. [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Net sales	174.9	161.1	489.1	414.5
Mueller Technologies [Member]
Segment Reporting Information [Line Items]
Net sales	137.3	133.5	381.3	362.5
Operating income	12.0	21.1	35.1	56.4
Depreciation and amortization	7.2	7.2	22.2	21.6
Restructuring and other charges	0.0	0.2	0.2	0.5
Payments to Acquire Productive Assets	2.6	3.5	7.1	8.4
Mueller Technologies [Member] | Central Region [Member]
Segment Reporting Information [Line Items]
Net sales	37.7	32.6	101.1	91.8
Mueller Technologies [Member] | Northeast Region [Member] [Member]
Segment Reporting Information [Line Items]
Net sales	25.4	24.2	78.1	72.8
Mueller Technologies [Member] | Southeast Region [Member]
Segment Reporting Information [Line Items]
Net sales	27.8	28.8	79.6	76.1
Mueller Technologies [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Net sales	30.8	28.2	77.8	73.2
Mueller Technologies [Member] | CANADA
Segment Reporting Information [Line Items]
Net sales	9.7	13.5	26.0	29.6
Mueller Technologies [Member] | Other International Locations [Member]
Segment Reporting Information [Line Items]
Net sales	5.9	6.2	18.7	19.0
Mueller Technologies [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Net sales	$ 121.7	$ 113.8	$ 336.6	$ 313.9

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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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