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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions				12 Months Ended
	Nov. 21, 2022	Nov. 10, 2022	Oct. 21, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Subsequent Event [Line Items]
Dividends declared, in dollars per share				$ 0.232	$ 0.22	$ 0.21
Stock Repurchased During Period, Shares				2,654,254	651,271	418,374
Stock Repurchased During Period, Value				$ 35.0	$ 10.0	$ 5.0
Intangible Assets, Net (Including Goodwill)				459.8	507.6
Inventories				278.7	184.7
Mueller Co. [Member]
Subsequent Event [Line Items]
Intangible Assets, Net (Including Goodwill)				302.6	324.1
Inventories				160.5	104.5
Mueller Technologies [Member]
Subsequent Event [Line Items]
Intangible Assets, Net (Including Goodwill)				157.2	183.5
Inventories				118.2	80.2
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. 21, 2022
Dividends declared, in dollars per share			$ 0.061
Dividends Payable, Date to be Paid	Nov. 21, 2022
Dividends Payable, Date of Record		Nov. 10, 2022

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Aggregate dividends declared during the period for each share of common stock outstanding.

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