Commitments and Contingencies (Details) $ in Millions	1 Months Ended				9 Months Ended	12 Months Ended
	Feb. 28, 2022 USD ($) smelter_site ft	Jan. 31, 2018 USD ($) potentially_responsible_party unilateral_administrative_order	Nov. 27, 2015 USD ($)	Aug. 31, 2015 mining_site	Sep. 24, 2022 USD ($) property potentially_responsible_party smelter_site	Oct. 31, 2008 importEntry	Sep. 25, 2021 USD ($)	Dec. 29, 2018 potentially_responsible_party	Nov. 08, 2016 USD ($)	Apr. 19, 2010
Loss Contingencies [Line Items]
Term of guarantees					1 year
Payments required to be made under guarantees, maximum					$ 33.1
United States Department of Commerce Antidumping Review
Loss Contingencies [Line Items]
Assignment of antidumping duty rate on U.S. imports by Company subsidiaries (as a percent)										48.33%
Payment for interest and duties			$ 3.0
Number of import entries | importEntry						795
Southeast Kansas Sites
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, gross	$ 5.6
Geographic boundary of sites | ft	50
Lead Refinery Site
Loss Contingencies [Line Items]
Financial guarantee									$ 1.0
Lead Refinery NPL Site
Loss Contingencies [Line Items]
Number of UAOs | unilateral_administrative_order		2
Number of PRPs | potentially_responsible_party		4
Environmental reserves		$ 4.5
Site contingency, total costs		25.0
Site contingency, amount agreed upon to pay PRPs for past costs		2.0
Site contingency, additional reimbursement of past costs		$ 0.7
Contingency charge					$ 7.6
Reserve for settlement							$ 3.3
Bonita Peak Mining District
Loss Contingencies [Line Items]
Number of mining sites | mining_site				48
Non operating Properties | Southeast Kansas Sites
Loss Contingencies [Line Items]
Number of parties involved in settlement negotiations | smelter_site	3				3
Non operating Properties | Southeast Kansas Sites - East La Harpe
Loss Contingencies [Line Items]
Number of parties involved in settlement negotiations | potentially_responsible_party					2			2
Non operating Properties | Shasta Area Mine Sites
Loss Contingencies [Line Items]
Period of permit, implementation of Best Management Practices					10 years
Estimated remediation costs, term					30 years
Non operating Properties | Lead Refinery Site
Loss Contingencies [Line Items]
Number of parties involved in settlement negotiations | potentially_responsible_party					2
Estimated remediation costs, term					15 years
Amount other PRPs will pay to fund cleanup					$ 26.0
Number of surrounding properties | property					300
Non operating Properties | Minimum | Shasta Area Mine Sites
Loss Contingencies [Line Items]
Estimated remediation costs					$ 14.0
Non operating Properties | Minimum | Lead Refinery Site
Loss Contingencies [Line Items]
Estimated remediation costs					1.6
Non operating Properties | Maximum | Shasta Area Mine Sites
Loss Contingencies [Line Items]
Estimated remediation costs					16.0
Non operating Properties | Maximum | Lead Refinery Site
Loss Contingencies [Line Items]
Estimated remediation costs					$ 2.3
Operating Properties | Southeast Kansas Sites - Lanyon
Loss Contingencies [Line Items]
Number of properties in remediation | property					1,371
Operating Properties | Mueller Copper Tube Products, Inc.
Loss Contingencies [Line Items]
Estimated remediation costs, term					4 years
Operating Properties | Minimum | Mueller Copper Tube Products, Inc.
Loss Contingencies [Line Items]
Estimated remediation costs					$ 0.7
Operating Properties | Maximum | Mueller Copper Tube Products, Inc.
Loss Contingencies [Line Items]
Estimated remediation costs					$ 0.9