Commitments and Contingencies	6 Months Ended
Jun. 28, 2014
Commitments and Contingencies [Abstract]
Commitments and Contingencies	Note 2 – Commitments and Contingencies The Company is involved in certain litigation as a result of claims that arose in the ordinary course of business, which management believes will not have a material adverse effect on the Company’s financial position, results of operations, or cash flows. The Company may also realize the benefit of certain legal claims and litigation in the future; these gain contingencies are not recognized in the Condensed Consolidated Financial Statements. United States Department of Commerce Antidumping Review On December 24, 2008, the United States Department of Commerce (DOC) initiated an antidumping administrative review of the antidumping duty order covering circular welded non-alloy steel pipe and tube from Mexico to determine the final antidumping duties owed on U.S. imports during the period November 1, 2007 through October 31, 2008, by certain subsidiaries of the Company. On April 19, 2010, the DOC published the final results of this review and assigned Mueller Comercial de Mexico, S. de R.L. de C.V. (Mueller Comercial) an antidumping duty rate of 48.3 percent. The Company appealed the final determination to the U.S. Court of International Trade (CIT). The Company and the United States have reached an agreement to settle the appeal. As a result, the DOC published on March 22, 2013 the amended final results of the review and assigned Mueller Comercial an antidumping duty rate of 40.5 percent. U.S. Customs and Border Protection has assessed antidumping duties on subject imports during the period of review. As of June 28, 2014, Mueller Comercial has complied with all requests for payment of duties related to this review period. On December 23, 2009, the DOC initiated an antidumping administrative review of the antidumping duty order covering circular welded non-alloy steel pipe and tube from Mexico for the November 1, 2008 through October 31, 2009 period of review. The DOC selected Mueller Comercial as a respondent in the review. On June 21, 2011, the DOC published the final results of the review and assigned Mueller Comercial an antidumping duty rate of 19.8 percent. On August 22, 2011, the Company appealed the final results to the CIT. On December 21, 2012, the CIT issued a decision upholding the Department’s final results in part. The CIT issued its final judgment on May 2, 2013. On May 6, 2013, the Company appealed the CIT decision to the U.S. Court of Appeals for the Federal Circuit (Federal Circuit). On May 29, 2014, the Federal Circuit issued its decision vacating the CIT’s decision and remanding the case back to DOC to reconsider the Company’s rate. The Company anticipates that certain of its subsidiaries will incur antidumping duties on subject imports made during the period of review and, as such, established a reserve of approximately $1.1 million for this matter. Subsequent to October 31, 2009, Mueller Comercial did not ship subject merchandise to the United States. Therefore, there is zero antidumping duty liability for periods of review after October 31, 2009. U.K. Actions Relating to the European Commission’s 2004 Copper Tube Decision and 2006 Copper Fittings Decision In the Competition Appeal Tribunal (the CAT) in the United Kingdom, IMI plc and IMI Kynoch Limited (IMI) and Boliden AB (Boliden) were served with claims by 21 claimants, all companies within the Travis Perkins Group (TP and the TP Claimants) regarding copper tube. The TP Claimants sought follow-on damages arising out of conduct described in the European Commission’s September 3, 2004, decision regarding copper tube. The claims purported to arise from the findings of the European Commission as set forth in that decision (Copper Tube Decision). IMI and Boliden commenced legal proceedings against Mueller Industries, Inc., WTC Holding Company, Inc., DENO Holding Company, Inc., Mueller Europe, Limited, and DENO Acquisition EURL (the five Mueller entities), and in those proceedings claimed a contribution for any follow-on damages. In the High Court in the United Kingdom, IMI has also been served with claims by 21 TP Claimants regarding copper fittings. The TP Claimants are seeking follow-on damages arising out of conduct described in the European Commission’s September 20, 2006, decision regarding copper fittings. The claims similarly purport to arise from the findings of the European Commission as set forth in that decision. IMI has commenced legal proceedings against Mueller Industries, Inc., Mueller Europe Limited, and WTC Holding Company, Inc. (the three Mueller entities), and in those proceedings are claiming a contribution for any follow-on damages. As to the claims arising from the Copper Tube Decision brought in the CAT, following the CAT’s grant of approval, the case was transferred to the High Court. Mueller’s defense in response to the contribution claims brought by IMI and Boliden was served on March 15, 2013. During the second quarter of 2014, a settlement was reached in respect of the claims against Mueller and the High Court has been asked to dismiss the claims against Mueller. The total payment made by Mueller pursuant to the settlement did not have a material impact on the Company’s financial position, results of operations, or cash flows. As to the claims arising from the Copper Fittings Decision, Mueller's defense in response to the contribution claims brought by IMI was served on May 30, 2014. A case management conference is anticipated to take place in late July 2014. At this time, the Company does not believe that the outstanding claims against Mueller relating to copper fittings will have a material impact on its financial position, results of operations, or cash flows. Other Guarantees, in the form of letters of credit, are issued by the Company generally to assure the payment of insurance deductibles and certain retiree health benefits. The terms of the Company’s guarantees are generally one year but are renewable annually as required. These letters are primarily backed by the Company’s revolving credit facility. The maximum payments that the Company could be required to make under its guarantees at June 28, 2014 were $10.3 million.

Note 2 – Commitments and Contingencies

The Company is involved in certain litigation as a result of claims that arose in the ordinary course of business, which management believes will not have a material adverse effect on the Company’s financial position, results of operations, or cash flows. The Company may also realize the benefit of certain legal claims and litigation in the future; these gain contingencies are not recognized in the Condensed Consolidated Financial Statements.

United States Department of Commerce Antidumping Review

On December 24, 2008, the United States Department of Commerce (DOC) initiated an antidumping administrative review of the antidumping duty order covering circular welded non-alloy steel pipe and tube from Mexico to determine the final antidumping duties owed on U.S. imports during the period November 1, 2007 through October 31, 2008, by certain subsidiaries of the Company. On April 19, 2010, the DOC published the final results of this review and assigned Mueller Comercial de Mexico, S. de R.L. de C.V. (Mueller Comercial) an antidumping duty rate of 48.3 percent. The Company appealed the final determination to the U.S. Court of International Trade (CIT). The Company and the United States have reached an agreement to settle the appeal. As a result, the DOC published on March 22, 2013 the amended final results of the review and assigned Mueller Comercial an antidumping duty rate of 40.5 percent. U.S. Customs and Border Protection has assessed antidumping duties on subject imports during the period of review. As of June 28, 2014, Mueller Comercial has complied with all requests for payment of duties related to this review period.

On December 23, 2009, the DOC initiated an antidumping administrative review of the antidumping duty order covering circular welded non-alloy steel pipe and tube from Mexico for the November 1, 2008 through October 31, 2009 period of review. The DOC selected Mueller Comercial as a respondent in the review. On June 21, 2011, the DOC published the final results of the review and assigned Mueller Comercial an antidumping duty rate of 19.8 percent. On August 22, 2011, the Company appealed the final results to the CIT. On December 21, 2012, the CIT issued a decision upholding the Department’s final results in part. The CIT issued its final judgment on May 2, 2013. On May 6, 2013, the Company appealed the CIT decision to the U.S. Court of Appeals for the Federal Circuit (Federal Circuit). On May 29, 2014, the Federal Circuit issued its decision vacating the CIT’s decision and remanding the case back to DOC to reconsider the Company’s rate. The Company anticipates that certain of its subsidiaries will incur antidumping duties on subject imports made during the period of review and, as such, established a reserve of approximately $1.1 million for this matter.

Subsequent to October 31, 2009, Mueller Comercial did not ship subject merchandise to the United States. Therefore, there is zero antidumping duty liability for periods of review after October 31, 2009.

U.K. Actions Relating to the European Commission’s 2004 Copper Tube Decision and 2006 Copper Fittings Decision

In the Competition Appeal Tribunal (the CAT) in the United Kingdom, IMI plc and IMI Kynoch Limited (IMI) and Boliden AB (Boliden) were served with claims by 21 claimants, all companies within the Travis Perkins Group (TP and the TP Claimants) regarding copper tube. The TP Claimants sought follow-on damages arising out of conduct described in the European Commission’s September 3, 2004, decision regarding copper tube. The claims purported to arise from the findings of the European Commission as set forth in that decision (Copper Tube Decision). IMI and Boliden commenced legal proceedings against Mueller Industries, Inc., WTC Holding Company, Inc., DENO Holding Company, Inc., Mueller Europe, Limited, and DENO Acquisition EURL (the five Mueller entities), and in those proceedings claimed a contribution for any follow-on damages.

In the High Court in the United Kingdom, IMI has also been served with claims by 21 TP Claimants regarding copper fittings. The TP Claimants are seeking follow-on damages arising out of conduct described in the European Commission’s September 20, 2006, decision regarding copper fittings. The claims similarly purport to arise from the findings of the European Commission as set forth in that decision. IMI has commenced legal proceedings against Mueller Industries, Inc., Mueller Europe Limited, and WTC Holding Company, Inc. (the three Mueller entities), and in those proceedings are claiming a contribution for any follow-on damages.

As to the claims arising from the Copper Tube Decision brought in the CAT, following the CAT’s grant of approval, the case was transferred to the High Court. Mueller’s defense in response to the contribution claims brought by IMI and Boliden was served on March 15, 2013. During the second quarter of 2014, a settlement was reached in respect of the claims against Mueller and the High Court has been asked to dismiss the claims against Mueller. The total payment made by Mueller pursuant to the settlement did not have a material impact on the Company’s financial position, results of operations, or cash flows.

As to the claims arising from the Copper Fittings Decision, Mueller's defense in response to the contribution claims brought by IMI was served on May 30, 2014. A case management conference is anticipated to take place in late July 2014. At this time, the Company does not believe that the outstanding claims against Mueller relating to copper fittings will have a material impact on its financial position, results of operations, or cash flows.

Other

Guarantees, in the form of letters of credit, are issued by the Company generally to assure the payment of insurance deductibles and certain retiree health benefits. The terms of the Company’s guarantees are generally one year but are renewable annually as required. These letters are primarily backed by the Company’s revolving credit facility. The maximum payments that the Company could be required to make under its guarantees at June 28, 2014 were $10.3 million.