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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Net sales, excluding intercompany	$ 226.9	$ 232.2	$ 199.7	$ 167.2	$ 215.6	$ 224.7	$ 197.2	$ 163.1	$ 826.0	$ 800.6	$ 793.4
Operating income	33.3	$ 42.6	$ 10.9	$ 13.9	37.8	$ 22.6	$ 21.1	$ 11.4	100.7	92.9	79.6
Depreciation and amortization									41.9	39.5	43.4
2016									10.4	23.8	20.0
Capital expenditures									(40.6)	(31.5)	(27.2)
Property, plant and equipment, net	122.3				108.4				122.3	108.4
Total assets	1,258.3				1,280.6				$ 1,258.3	1,280.6
Document Period End Date									Sep. 30, 2017
Intangible Assets, Net (Including Goodwill)	439.3				434.6				$ 439.3	434.6
Mueller Co. [Member]
Segment Reporting Information [Line Items]
Net sales, excluding intercompany									739.9	715.7	702.2
Operating income									163.4	159.3	136.9
Depreciation and amortization									36.3	34.2	38.8
2016									2.7	3.0	8.4
Capital expenditures									(28.5)	(24.3)	(20.5)
Total assets	792.6				750.4				792.6	750.4
Intangible Assets, Net (Including Goodwill)	417.2				416.9				417.2	416.9
Mueller Technologies [Member]
Segment Reporting Information [Line Items]
Net sales, excluding intercompany									86.1	84.9	91.2
Operating income									(20.3)	(11.1)	(12.9)
Depreciation and amortization									5.2	4.8	4.2
2016									0.7	0.9	0.1
Capital expenditures									(11.4)	(7.0)	(6.5)
Total assets	88.4				86.1				88.4	86.1
Intangible Assets, Net (Including Goodwill)	22.1				17.7				22.1	17.7
Corporate [Member]
Segment Reporting Information [Line Items]
Net sales, excluding intercompany									0.0	0.0	0.0
Operating income									(42.4)	(55.3)	(44.4)
Depreciation and amortization									0.4	0.5	0.4
2016									7.0	19.9	11.5
Capital expenditures									(0.7)	(0.2)	(0.2)
Total assets	377.3				444.1				377.3	444.1
Intangible Assets, Net (Including Goodwill)	$ 0.0				$ 0.0				0.0	0.0
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Intercompany sales									1.1	5.8	7.2
Intersegment Eliminations [Member] | Mueller Co. [Member]
Segment Reporting Information [Line Items]
Intercompany sales									1.1	5.8	7.2
Intersegment Eliminations [Member] | Mueller Technologies [Member]
Segment Reporting Information [Line Items]
Intercompany sales									0.0	0.0	0.0
Intersegment Eliminations [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Intercompany sales									$ 0.0	$ 0.0	$ 0.0

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