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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, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Net sales, excluding intercompany	$ 302.5	$ 310.1	$ 283.6	$ 242.7	$ 311.4	$ 301.0	$ 290.3	$ 261.8	$ 1,138.9	$ 1,164.5	$ 1,184.7
Operating income	46.7	$ 29.7	$ 29.3	$ 14.9	44.4	$ 31.5	$ 25.6	$ 8.1	120.6	109.6	124.1
Depreciation and amortization									52.6	58.1	56.7
2016									24.9	21.3	3.1
Capital expenditures									(39.4)	(37.5)	(36.9)
Property, plant and equipment, net	155.1				148.9				155.1	148.9
Total assets	1,280.6				1,229.8				$ 1,280.6	1,229.8
Document Period End Date									Sep. 30, 2016
Intangible Assets, Net (Including Goodwill)	486.0				507.3				$ 486.0	507.3
Mueller Co. [Member]
Segment Reporting Information [Line Items]
Net sales, excluding intercompany									715.7	702.2	679.1
Operating income									159.3	136.9	126.7
Depreciation and amortization									34.2	38.8	38.0
2016									3.0	8.4	2.1
Capital expenditures									(24.3)	(20.5)	(18.8)
Total assets	750.4				757.7				750.4	757.7
Intangible Assets, Net (Including Goodwill)	416.9				435.5				416.9	435.5
Anvil [Member]
Segment Reporting Information [Line Items]
Net sales, excluding intercompany									338.3	371.1	401.4
Operating income									26.8	30.0	41.3
Depreciation and amortization									13.1	14.7	14.2
2016									2.3	0.7	0.9
Capital expenditures									(7.9)	(10.3)	(11.6)
Total assets	243.5				255.3				243.5	255.3
Intangible Assets, Net (Including Goodwill)	51.4				54.5				51.4	54.5
Mueller Technologies [Member]
Segment Reporting Information [Line Items]
Net sales, excluding intercompany									84.9	91.2	104.2
Operating income									(11.1)	(12.9)	(4.4)
Depreciation and amortization									4.8	4.2	4.1
2016									0.9	0.1	0.1
Capital expenditures									(7.0)	(6.5)	(6.1)
Total assets	86.1				77.2				86.1	77.2
Intangible Assets, Net (Including Goodwill)	17.7				17.3				17.7	17.3
Corporate [Member]
Segment Reporting Information [Line Items]
Net sales, excluding intercompany									0.0	0.0	0.0
Operating income									(54.4)	(44.4)	(39.5)
Depreciation and amortization									0.5	0.4	0.4
2016									18.7	12.1	0.0
Capital expenditures									(0.2)	(0.2)	(0.4)
Total assets	200.6				139.6				200.6	139.6
Intangible Assets, Net (Including Goodwill)	$ 0.0				$ 0.0				0.0	0.0
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Intercompany sales									5.9	7.3	6.8
Intersegment Eliminations [Member] | Mueller Co. [Member]
Segment Reporting Information [Line Items]
Intercompany sales									5.8	7.2	6.7
Intersegment Eliminations [Member] | Anvil [Member]
Segment Reporting Information [Line Items]
Intercompany sales									0.1	0.1	0.1
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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