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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018 | Dec. 29, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | $ 700,871 | $ 682,405 | $ 1,393,010 | $ 1,381,089 |
Contract with customer, liability, current | 66,128 |  | 66,128 |  | $ 4,906
Revenue recognized from contract liability | 897 | 1,632 | 1,928 | 4,456 |
Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 485,581 | 474,740 | 950,432 | 952,025 |
Transferred over Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 215,290 | 207,665 | 442,578 | 429,064 |
Utility Support Structures Segment |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 209,009 | 196,531 | 452,267 | 406,390 |
Utility Support Structures Segment | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 9,932 | 0 | 40,224 | 0 |
Utility Support Structures Segment | Transferred over Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 199,077 | 196,531 | 412,043 | 406,390 |
Engineered Support Structures Segment |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 257,565 | 246,041 | 485,534 | 461,957 |
Engineered Support Structures Segment | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 244,604 | 237,720 | 461,074 | 444,914 |
Engineered Support Structures Segment | Transferred over Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 12,961 | 8,321 | 24,460 | 17,043 |
Coatings Segment |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 81,089 | 74,539 | 151,320 | 142,997 |
Coatings Segment | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 81,089 | 74,539 | 151,320 | 142,997 |
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 | 153,208 | 160,613 | 303,889 | 346,665 |
Irrigation Segment | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | 149,956 | 157,800 | 297,814 | 341,034 |
Irrigation Segment | Transferred over Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer | $ 3,252 | 2,813 | $ 6,075 | 5,631 |
Other Segments | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer |  | 4,681 |  | 23,080 |
Other Segments | Transferred over Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customer |  | $ 0 |  | $ 0 |

X
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