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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 3 Months Ended
Mar. 27, 2021
Accounting Policies [Abstract]  
Components of inventories
Inventories consisted of the following:
March 27,
2021		December 26,
2020
Raw materials and purchased parts
$185,995 $155,512 
Work-in-process
36,916 33,632 
Finished goods and manufactured goods
290,013 259,797 
Total Inventory$512,924 $448,941 
Earnings before income taxes
Earnings before income taxes for the thirteen weeks ended March 27, 2021 and March 28, 2020, were as follows:    
Thirteen weeks ended
20212020
United States
$51,155 $53,500 
Foreign
19,708 3,926 
$70,863 $57,426 
Schedule of components of the net periodic pension (benefit) expense
The components of the net periodic pension (benefit) expense for the thirteen weeks ended March 27, 2021 and March 28, 2020 were as follows:
Thirteen weeks ended
Net periodic (benefit) expense:20212020
Interest cost
$2,497 $3,124 
Expected return on plan assets
(7,005)(5,598)
Amortization of actuarial loss
832 711 
Net periodic (benefit) expense
$(3,676)$(1,763)
Compensation expense (included in selling, general and administrative expenses) and associated income tax benefits related to stock options
The Company's compensation expense (included in selling, general and administrative expenses) and associated income tax benefits related to stock options and restricted stock for the thirteen weeks ended March 27, 2021 and March 28, 2020, respectively, were as follows:
Thirteen weeks ended
20212020
Compensation expense
$4,671 $3,325 
Income tax benefits
1,168 831 
Valuation methodologies used for assets and liabilities measured at fair value
Fair Value Measurement Using:
Carrying Value March 27, 2021Quoted Prices in
Active Markets
for Identical
Assets (Level 1)		Significant Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Assets:
Trading Securities
$36,071 $36,071 $— $— 
Derivative financial instruments, net
8,849 — 8,849 — 

Fair Value Measurement Using:
Carrying Value December 26, 2020Quoted Prices in
Active Markets
for Identical
Assets (Level 1)		Significant Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Assets:
Trading Securities
$35,327 $35,327 $— $— 
Liabilities:
Derivative financial instruments, net
(5,911)— (5,911)— 
Components of accumulated other comprehensive income (loss) Accumulated other comprehensive income (loss) consisted of the following at March 27, 2021 and December 26, 2020:
Foreign Currency Translation AdjustmentsGain on Hedging ActivitiesDefined Benefit Pension PlanAccumulated Other Comprehensive Loss
Balance at December 26, 2020$(213,064)$15,550 $(112,272)$(309,786)
   Current-period comprehensive income (loss)(12,160)13,558 832 2,230 
Balance at March 27, 2021$(225,224)$29,108 $(111,440)$(307,556)
Disaggregation of revenue A breakdown by segment of revenue recognized over time and at a point in time for the thirteen weeks ended March 27, 2021 and March 28, 2020 is as follows:
Point in TimeOver TimePoint in TimeOver Time
Thirteen weeks ended March 27, 2021Thirteen weeks ended March 27, 2021Thirteen weeks ended March 28, 2020Thirteen weeks ended March 28, 2020
Utility Support Structures$6,294 $246,404 $8,924 $214,024 
Engineered Support Structures
213,846 8,310 215,879 11,487 
Coatings
71,591 — 68,590 — 
Irrigation
224,637 3,804 151,742 3,554 
  Total
$516,368 $258,518 $445,135 $229,065