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Schedule II - Valuation And Qualifying Accounts
 12 Months Ended
Dec. 27, 2025
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation And Qualifying Accounts
MUELLER INDUSTRIES, INC.
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
Years Ended December 27, 2025, December 28, 2024, and December 30, 2023
  
  Additions  
(In thousands)Balance at beginning of yearCharged to costs and expensesOther additionsDeductionsBalance at end
of year
2025     
Allowance for credit losses$3,724 $143 $5 $1,327 $2,545 
Environmental reserves
$18,414 $1,980 $205 $1,727 $18,872 
Valuation allowance for deferred tax assets
$16,692 $(1,027)$21 $— $15,686 
 
2024     
Allowance for credit losses$2,830 $1,147 $5 $258 $3,724 
Environmental reserves
$18,940 $1,785 $— $2,311 $18,414 
Valuation allowance for deferred tax assets
$23,078 $(4,931)$— $1,455 $16,692 
 
2023
 
 
 
 
 
Allowance for credit losses$2,687 $(84)$227 $— $2,830 
Environmental reserves
$20,534 $652 $— $2,246 $18,940 
Valuation allowance for deferred tax assets
$21,504 $4,939 $267 $3,632 $23,078