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BUSINESS SEGMENTS (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 26, 2020 USD ($) | Sep. 26, 2020 USD ($) | Jun. 27, 2020 USD ($) | Mar. 28, 2020 USD ($) | Dec. 28, 2019 USD ($) | Sep. 28, 2019 USD ($) | Jun. 29, 2019 USD ($) | Mar. 30, 2019 USD ($) | Dec. 26, 2020 USD ($) segment | Dec. 28, 2019 USD ($) | Dec. 29, 2018 USD ($)
Business Segments |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 4 |  |
Maximum percentage of sales of other businesses and activities to consolidated sales as basis for aggregation |  |  |  |  |  |  |  |  | 10.00% |  |
Net sales | $ 798,377 | $ 733,970 | $ 688,808 | $ 674,200 | $ 683,626 | $ 690,340 | $ 700,871 | $ 692,139 | $ 2,895,355 | $ 2,766,976 | $ 2,757,144
Operating income |  |  |  |  |  |  |  |  | 225,953 | 227,905 | 212,172
Interest expense, net |  |  |  |  |  |  |  |  | (38,701) | (36,211) | (39,569)
Costs associated with refinancing of debt |  |  |  |  |  |  |  |  | 0 | 0 | (14,820)
Loss from divestiture of grinding media business |  |  |  |  |  |  |  |  | 0 | 0 | (6,084)
Other |  |  |  |  |  |  |  |  | 5,516 | 8,164 | 1,634
Earnings before income taxes and equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 192,768 | 199,858 | 153,333
Total assets | 2,953,160 |  |  |  | 2,807,216 |  |  |  | 2,953,160 | 2,807,216 | 2,583,894
Capital expenditures |  |  |  |  |  |  |  |  | 106,700 | 97,425 | 71,985
Depreciation and amortization |  |  |  |  |  |  |  |  | 82,892 | 82,264 | 82,827
Engineered Support Structures |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 983,523 | 1,002,076 | 967,358
Operating income |  |  |  |  |  |  |  |  | 65,342 | 65,627 | 34,776
Total assets | 932,565 |  |  |  | 944,428 |  |  |  | 932,565 | 944,428 | 868,336
Capital expenditures |  |  |  |  |  |  |  |  | 24,447 | 25,344 | 26,783
Depreciation and amortization |  |  |  |  |  |  |  |  | 25,399 | 26,280 | 27,274
Utility Support Structures |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,002,138 | 885,608 | 855,206
Operating income |  |  |  |  |  |  |  |  | 100,855 | 87,788 | 64,766
Total assets | 778,127 |  |  |  | 742,194 |  |  |  | 778,127 | 742,194 | 700,915
Capital expenditures |  |  |  |  |  |  |  |  | 34,495 | 26,306 | 17,442
Depreciation and amortization |  |  |  |  |  |  |  |  | 23,641 | 23,779 | 23,618
Coatings |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 300,640 | 286,739
Operating income |  |  |  |  |  |  |  |  | 42,975 | 51,008 | 55,325
Total assets | 360,594 |  |  |  | 363,070 |  |  |  | 360,594 | 363,070 | 294,951
Capital expenditures |  |  |  |  |  |  |  |  | 22,132 | 23,610 | 10,320
Depreciation and amortization |  |  |  |  |  |  |  |  | 15,793 | 15,907 | 15,956
Irrigation |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 640,092 | 578,652 | 624,761
Operating income |  |  |  |  |  |  |  |  | 83,046 | 71,687 | 97,722
Total assets | 465,322 |  |  |  | 347,887 |  |  |  | 465,322 | 347,887 | 347,894
Capital expenditures |  |  |  |  |  |  |  |  | 16,740 | 15,644 | 7,249
Depreciation and amortization |  |  |  |  |  |  |  |  | 12,098 | 10,943 | 11,335
Other |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 0 | 0 | (913)
Capital expenditures |  |  |  |  |  |  |  |  | 0 | 0 | 7
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 775
Corporate |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | (66,265) | (48,205) | (39,504)
Total assets | $ 416,552 |  |  |  | $ 409,637 |  |  |  | 416,552 | 409,637 | 371,798
Capital expenditures |  |  |  |  |  |  |  |  | 8,886 | 6,521 | 10,184
Depreciation and amortization |  |  |  |  |  |  |  |  | 5,961 | 5,355 | 3,869
Operating segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 2,989,192 | 2,855,901 | 2,856,150
Operating segment | Engineered Support Structures |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 995,840 | 1,012,290 | 986,880
Operating segment | Engineered Support Structures | Lighting, Traffic, and Highway Safety Products |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 717,216 | 708,853 | 706,582
Operating segment | Engineered Support Structures | Communication Products |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 190,203 | 188,912 | 149,817
Operating segment | Engineered Support Structures | Access Systems |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 88,421 | 114,525 | 130,481
Operating segment | Utility Support Structures |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,002,209 | 890,580 | 859,173
Operating segment | Utility Support Structures | Steel |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 635,220 | 630,892 | 637,979
Operating segment | Utility Support Structures | Concrete |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 160,544 | 122,032 | 111,875
Operating segment | Utility Support Structures | Engineered Solar Tracker Solutions |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 86,382 | 47,450 | 16,760
Operating segment | Utility Support Structures | Offshore and Other Complex Steel Structures |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 120,063 | 90,206 | 92,559
Operating segment | Coatings |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 345,312 | 367,835 | 353,351
Operating segment | Irrigation |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 645,831 | 585,196 | 633,666
Operating segment | Irrigation | North America |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 378,424 | 378,613 | 386,683
Operating segment | Irrigation | International |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 267,407 | 206,583 | 246,983
Segment Reconciling Items | Other |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0 | 0 | 23,080
Net sales |  |  |  |  |  |  |  |  | 0 | 0 | 23,080
Intersegment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 93,837 | 88,925 | 99,006
Intersegment | Engineered Support Structures |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 12,317 | 10,214 | 19,522
Intersegment | Utility Support Structures |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 71 | 4,972 | 3,967
Intersegment | Coatings |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 75,710 | 67,195 | 66,612
Intersegment | Irrigation |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 5,739 | $ 6,544 | $ 8,905

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