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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 26, 2020
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 26, 2020, December 28, 2019, and December 29, 2018
  
  Additions  
(In thousands)Balance at beginning of yearCharged to costs and expensesOther additionsDeductionsBalance at end
of year
2020     
Allowance for doubtful accounts
$770 $1,208 $— $440 $1,538 
Environmental reserves
$20,866 $4,242 $— $1,107 $24,001 
Valuation allowance for deferred tax assets
$23,130 $2,317 $1,898 $146 $27,199 
 
2019     
Allowance for doubtful accounts
$836 $(81)$263 $248 $770 
Environmental reserves
$23,619 $1,659 $— $4,412 $20,866 
Valuation allowance for deferred tax assets
$25,311 $2,919 $290 $5,390 $23,130 
 
2018
 
 
 
 
 
Allowance for doubtful accounts
$980 $(286)$220 $78 $836 
Environmental reserves
$28,004 $1,981 $— $6,366 $23,619 
Valuation allowance for deferred tax assets
$30,316 $1,209 $150 $6,364 $25,311