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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions				12 Months Ended
	Nov. 20, 2023	Nov. 09, 2023	Oct. 24, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Subsequent Event [Line Items]
Dividends declared, in dollars per share				$ 0.244	$ 0.232	$ 0.220
Stock Repurchased During Period, Shares				714,830	2,654,254	651,271
Stock Repurchased During Period, Value				$ 10.0	$ 35.0	$ 10.0
Intangible Assets, Net (Including Goodwill)				427.7	459.8
Inventories				297.9	278.7
Restructuring Charges				10.2	7.2	$ 5.4
Mueller Co. [Member]
Subsequent Event [Line Items]
Intangible Assets, Net (Including Goodwill)				283.8	302.6
Inventories				173.8	160.5
Mueller Technologies [Member]
Subsequent Event [Line Items]
Intangible Assets, Net (Including Goodwill)				143.9	157.2
Inventories				124.1	118.2
Corporate [Member]
Subsequent Event [Line Items]
Intangible Assets, Net (Including Goodwill)				0.0	0.0
Inventories				$ 0.0	$ 0.0
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends Payable, Date Declared			Oct. 24, 2023
Dividends declared, in dollars per share			$ 0.064
Dividends Payable, Date to be Paid	Nov. 20, 2023
Dividends Payable, Date of Record		Nov. 09, 2023

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