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BUSINESS SEGMENTS (Details) | 3 Months Ended | 12 Months Ended
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Dec. 26, 2015 USD ($) | Sep. 26, 2015 USD ($) | Jun. 27, 2015 USD ($) | Mar. 28, 2015 USD ($) | Dec. 27, 2014 USD ($) | Sep. 27, 2014 USD ($) | Jun. 28, 2014 USD ($) | Mar. 29, 2014 USD ($) | Dec. 26, 2015 USD ($) segment | Dec. 27, 2014 USD ($) | Dec. 28, 2013 USD ($)
Business Segments |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 5 |  |
Maximum percentage of sales of other businesses and activities to consolidated sales as basis for aggregation |  |  |  |  |  |  |  |  | 10.00% |  |
Net sales | $ 633,828,000 | $ 632,575,000 | $ 682,123,000 | $ 670,398,000 | $ 763,136,000 | $ 765,668,000 | $ 842,599,000 | $ 751,740,000 | $ 2,618,924,000 | $ 3,123,143,000 | $ 3,304,211,000
Operating Income |  |  |  |  |  |  |  |  | 131,695,000 | 357,716,000 | 473,069,000
Interest expense, net |  |  |  |  |  |  |  |  | (41,325,000) | (30,744,000) | (26,025,000)
Costs associated with refinancing of debt |  |  |  |  |  |  |  |  | 0 | (38,705,000) | 0
Other |  |  |  |  |  |  |  |  | 2,637,000 | (4,084,000) | 2,373,000
Earnings before income taxes and equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 93,007,000 | 284,183,000 | 449,417,000
Total assets | 2,399,428,000 |  |  |  | 2,729,668,000 |  |  |  | 2,399,428,000 | 2,729,668,000 | 2,776,494,000
Capital expenditures |  |  |  |  |  |  |  |  | 45,468,000 | 73,023,000 | 106,753,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 91,144,000 | 89,328,000 | 77,436,000
Engineered Support Structures |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 748,450,000 | 735,007,000 | 696,337,000
Operating Income |  |  |  |  |  |  |  |  | 59,592,000 | 66,024,000 | 65,861,000
Total assets | 611,201,000 |  |  |  | 640,132,000 |  |  |  | 611,201,000 | 640,132,000 | 616,231,000
Capital expenditures |  |  |  |  |  |  |  |  | 11,445,000 | 11,849,000 | 12,905,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 22,810,000 | 22,363,000 | 22,037,000
Energy and Mining Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 333,207,000 | 443,688,000 | 339,800,000
Operating Income |  |  |  |  |  |  |  |  | (18,762,000) | 41,342,000 | 35,087,000
Total assets | 396,366,000 |  |  |  | 500,407,000 |  |  |  | 396,366,000 | 500,407,000 | 353,018,000
Capital expenditures |  |  |  |  |  |  |  |  | 3,544,000 | 4,893,000 | 4,515,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 20,733,000 | 22,146,000 | 13,167,000
Utility Support Structures Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 673,338,000 | 822,565,000 | 959,695,000
Operating Income |  |  |  |  |  |  |  |  | 37,847,000 | 95,118,000 | 174,740,000
Total assets | 422,021,000 |  |  |  | 470,720,000 |  |  |  | 422,021,000 | 470,720,000 | 524,113,000
Capital expenditures |  |  |  |  |  |  |  |  | 11,815,000 | 9,014,000 | 39,347,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 17,959,000 | 17,811,000 | 14,375,000
Coatings |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 255,473,000 | 278,435,000 | 300,986,000
Operating Income |  |  |  |  |  |  |  |  | 27,369,000 | 60,921,000 | 74,917,000
Total assets | 270,793,000 |  |  |  | 301,707,000 |  |  |  | 270,793,000 | 301,707,000 | 315,663,000
Capital expenditures |  |  |  |  |  |  |  |  | 6,836,000 | 14,029,000 | 12,206,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 12,962,000 | 14,615,000 | 14,656,000
Irrigation Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 605,771,000 | 839,717,000 | 964,367,000
Operating Income |  |  |  |  |  |  |  |  | 84,537,000 | 151,508,000 | 206,394,000
Total assets | 310,967,000 |  |  |  | 360,883,000 |  |  |  | 310,967,000 | 360,883,000 | 351,742,000
Capital expenditures |  |  |  |  |  |  |  |  | 7,756,000 | 21,113,000 | 26,039,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 11,746,000 | 10,471,000 | 7,859,000
Other |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,685,000 | 3,731,000 | 43,026,000
Operating Income |  |  |  |  |  |  |  |  | (9,802,000) | (1,535,000) | (7,213,000)
Total assets | 2,267,000 |  |  |  | 4,930,000 |  |  |  | 2,267,000 | 4,930,000 | 2,538,000
Capital expenditures |  |  |  |  |  |  |  |  | 1,396,000 | 1,181,000 | 105,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 570,000 | 123,000 | 2,336,000
Corporate |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | (49,086,000) | (55,662,000) | (76,717,000)
Total assets | 385,813,000 |  |  |  | 450,889,000 |  |  |  | 385,813,000 | 450,889,000 | 613,189,000
Capital expenditures |  |  |  |  |  |  |  |  | 2,676,000 | 10,944,000 | 11,636,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,364,000 | 1,799,000 | 3,006,000
Parent |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,169,674,000 | 1,392,509,000 | 1,540,266,000
Operating Income |  |  |  |  |  |  |  |  | 85,097,000 | 154,714,000 | 223,896,000
Other |  |  |  |  |  |  |  |  | (2,374,000) | 2,021,000 | 4,791,000
Earnings before income taxes and equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 39,180,000 | 83,801,000 | 197,941,000
Total assets | $ 1,873,422,000 |  |  |  | $ 2,167,173,000 |  |  |  | 1,873,422,000 | 2,167,173,000 |
Capital expenditures |  |  |  |  |  |  |  |  | 14,362,000 | 41,260,000 | 76,582,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 29,433,000 | 24,509,000 | 21,270,000
Operating segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 2,705,722,000 | 3,269,256,000 | 3,482,651,000
Operating segment | Engineered Support Structures |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 771,453,000 | 809,970,000 | 800,311,000
Operating segment | Engineered Support Structures | Lighting, Traffic, and Roadway Products |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 600,280,000 | 648,352,000 | 660,423,000
Operating segment | Engineered Support Structures | Communication Products |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 171,173,000 | 161,618,000 | 139,888,000
Operating segment | Energy and Mining Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 337,859,000 | 443,983,000 | 340,132,000
Operating segment | Energy and Mining Segment | Offshore and Other Complex Steel Structures |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 103,068,000 | 146,432,000 | 0
Operating segment | Energy and Mining Segment | Grinding Media |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 96,442,000 | 116,056,000 | 138,634,000
Operating segment | Energy and Mining Segment | Access Systems |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 138,349,000 | 181,495,000 | 201,498,000
Operating segment | Utility Support Structures Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 674,577,000 | 825,016,000 | 962,038,000
Operating segment | Utility Support Structures Segment | Steel |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 578,996,000 | 714,427,000 | 853,459,000
Operating segment | Utility Support Structures Segment | Concrete |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 95,581,000 | 110,589,000 | 108,579,000
Operating segment | Coatings |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 302,385,000 | 333,853,000 | 357,635,000
Operating segment | Irrigation Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 612,201,000 | 846,326,000 | 970,890,000
Operating segment | Other |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 7,247,000 | 10,108,000 | 51,645,000
Intersegment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 86,798,000 | 146,113,000 | 178,440,000
Intersegment | Engineered Support Structures |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 23,003,000 | 74,963,000 | 103,974,000
Intersegment | Energy and Mining Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 4,652,000 | 295,000 | 332,000
Intersegment | Utility Support Structures Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,239,000 | 2,451,000 | 2,343,000
Intersegment | Coatings |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 46,912,000 | 55,418,000 | 56,649,000
Intersegment | Irrigation Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 6,430,000 | 6,609,000 | 6,523,000
Intersegment | Other |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 4,562,000 | $ 6,377,000 | $ 8,619,000

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