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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated other comprehensive loss
Treasury Stock
Noncontrolling Interest
Balance at beginning of period at Dec. 30, 2023   $ 1,604 $ 312,171 $ 2,594,300 $ (47,221) $ (523,409) $ 21,271
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
(Issuance) acquisition of shares under incentive stock option plans     433        
Stock-based compensation expense     19,956        
Net income attributable to Mueller Industries, Inc. $ 467,227     467,227      
Dividends paid or payable to stockholders of Mueller Industries, Inc.       (68,605)      
Total other comprehensive (loss) income attributable to Mueller Industries, Inc. (6,741)       (6,012)    
Issuance (acquisition) of shares under incentive stock option plans           (23,381)  
Repurchase of common stock           (48,681)  
Issuance of restricted stock     (8,992)     8,992  
Investment in Joining Systems JV             0
Dividends paid to noncontrolling interests             0
Net income attributable to noncontrolling interests (9,712)           9,712
Foreign currency translation (5,909)           (729)
Balance at end of period at Sep. 28, 2024   1,604 323,568 2,992,922 (53,233) (586,479) 30,254
Balance at beginning of period at Jun. 29, 2024   1,604 325,763 2,847,420 (60,162) (568,522) 26,755
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
(Issuance) acquisition of shares under incentive stock option plans     90        
Stock-based compensation expense     6,480        
Net income attributable to Mueller Industries, Inc. 168,699     168,699      
Dividends paid or payable to stockholders of Mueller Industries, Inc.       (23,197)      
Total other comprehensive (loss) income attributable to Mueller Industries, Inc. 7,344       6,929    
Issuance (acquisition) of shares under incentive stock option plans           (21,035)  
Repurchase of common stock           (5,687)  
Issuance of restricted stock     (8,765)     8,765  
Investment in Joining Systems JV             0
Dividends paid to noncontrolling interests             0
Net income attributable to noncontrolling interests (3,084)           3,084
Foreign currency translation 6,117           415
Balance at end of period at Sep. 28, 2024   1,604 323,568 2,992,922 (53,233) (586,479) 30,254
Balance at beginning of period at Dec. 28, 2024 2,804,408 1,604 330,532 3,107,838 (80,279) (586,530) 31,243
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
(Issuance) acquisition of shares under incentive stock option plans     590        
Stock-based compensation expense     20,328        
Net income attributable to Mueller Industries, Inc. 611,479     611,479      
Dividends paid or payable to stockholders of Mueller Industries, Inc.       (83,701)      
Total other comprehensive (loss) income attributable to Mueller Industries, Inc. 21,313       21,804    
Issuance (acquisition) of shares under incentive stock option plans           (30,119)  
Repurchase of common stock           (243,615)  
Issuance of restricted stock     (10,042)     10,042  
Investment in Joining Systems JV 600            
Dividends paid to noncontrolling interests             (12,240)
Net income attributable to noncontrolling interests (6,539)           6,539
Foreign currency translation 20,318           (491)
Balance at end of period at Sep. 27, 2025 3,095,582 1,604 341,408 3,635,616 (58,475) (850,222) 25,651
Balance at beginning of period at Jun. 28, 2025   1,604 344,906 3,455,935 (51,115) (834,770) 24,063
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
(Issuance) acquisition of shares under incentive stock option plans     (95)        
Stock-based compensation expense     6,388        
Net income attributable to Mueller Industries, Inc. 208,123     208,123      
Dividends paid or payable to stockholders of Mueller Industries, Inc.       (28,442)      
Total other comprehensive (loss) income attributable to Mueller Industries, Inc. (7,897)       (7,360)    
Issuance (acquisition) of shares under incentive stock option plans           (25,243)  
Repurchase of common stock           0  
Issuance of restricted stock     (9,791)     9,791  
Investment in Joining Systems JV             0
Dividends paid to noncontrolling interests             0
Net income attributable to noncontrolling interests (2,125)           2,125
Foreign currency translation (6,701)           (537)
Balance at end of period at Sep. 27, 2025 $ 3,095,582 $ 1,604 $ 341,408 $ 3,635,616 $ (58,475) $ (850,222) $ 25,651