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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 26, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019 | Dec. 28, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | $ 733,970 | $ 690,340 | $ 2,096,978 | $ 2,083,350 |
Contract assets | 113,254 |  | 113,254 |  | $ 141,322
Contract liabilties | 153,619 |  | 153,619 |  |
Contract liabilities, current | 116,470 |  | 116,470 |  | $ 117,945
Revenue recognized from contract liability | 16,333 | 314 | 55,610 | 2,242 |
Contract Liabilities |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract liabilities, current | 116,470 |  | 116,470 |  |
Other Noncurrent Liabilities |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract liabilities, noncurrent | 37,149 |  | 37,149 |  |
Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 490,769 | 471,934 | 1,385,005 | 1,422,365 |
Transferred over Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 243,201 | 218,406 | 711,973 | 660,985 |
Utility Support Structures Segment |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 272,479 | 204,196 | 723,900 | 656,463 |
Utility Support Structures Segment | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 43,287 | 3,418 | 56,830 | 43,642 |
Utility Support Structures Segment | Transferred over Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 229,192 | 200,778 | 667,070 | 612,821 |
Engineered Support Structures Segment |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 254,945 | 266,494 | 731,184 | 752,028 |
Engineered Support Structures Segment | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 244,785 | 252,501 | 697,491 | 713,574 |
Engineered Support Structures Segment | Transferred over Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 10,160 | 13,993 | 33,693 | 38,454 |
Coatings Segment |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 68,698 | 76,922 | 199,955 | 228,242 |
Coatings Segment | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 68,698 | 76,922 | 199,955 | 228,242 |
Coatings Segment | Transferred over Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 0 | 0 | 0 | 0 |
Irrigation Segment |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 137,848 | 142,728 | 441,939 | 446,617 |
Irrigation Segment | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 133,999 | 139,093 | 430,729 | 436,907 |
Irrigation Segment | Transferred over Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | $ 3,849 | $ 3,635 | $ 11,210 | $ 9,710 |

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