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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 29, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Inventories | $ 383,566 |  |  |  | $ 420,948 |  |  |  | $ 383,566 | $ 420,948 |  |
Contract asset - costs and profits in excess of billings | 112,525 |  |  |  | 16,165 |  |  |  | 112,525 | 16,165 |  |
Accrued expenses | 91,942 |  |  |  | 81,029 |  |  |  | 91,942 | 81,029 |  |
Deferred income taxes | 43,489 |  |  |  | 34,906 |  |  |  | 43,489 | 34,906 |  |
Retained earnings | 2,027,596 |  |  |  | 1,954,344 |  |  |  | 2,027,596 | 1,954,344 |  |
Net sales | 697,363 | $ 678,692 | $ 682,405 | $ 698,684 | 714,978 | $ 680,779 | $ 712,737 | $ 637,473 | 2,757,144 | 2,745,967 | $ 2,521,676 |
Operating income |  |  |  |  |  |  |  |  | 202,280 | 267,080 | 245,374 |
Contract with customer, liability, current | 4,906 |  |  |  | 7 |  |  |  | 4,906 | 7 |  |
Contract with customer, liability, revenue recognized |  |  |  |  |  |  |  |  | 5,222 |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Inventories | 446,267 |  |  |  | (36,243) |  |  |  | 446,267 | (36,243) |  |
Contract asset - costs and profits in excess of billings | 24,647 |  |  |  | 51,507 |  |  |  | 24,647 | 51,507 |  |
Accrued expenses | 86,174 |  |  |  | 2,043 |  |  |  | 86,174 | 2,043 |  |
Deferred income taxes | 38,492 |  |  |  | 3,450 |  |  |  | 38,492 | 3,450 |  |
Retained earnings | 2,013,184 |  |  |  | 9,771 |  |  |  | 2,013,184 | 9,771 |  |
Net sales |  |  |  |  |  |  |  |  | 2,720,773 |  |  |
Operating income |  |  |  |  |  |  |  |  | 196,092 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Inventories | (62,701) |  |  |  | 384,705 |  |  |  | (62,701) | 384,705 |  |
Contract asset - costs and profits in excess of billings | 87,878 |  |  |  | 67,672 |  |  |  | 87,878 | 67,672 |  | $ 51,507
Accrued expenses | 5,768 |  |  |  | 83,072 |  |  |  | 5,768 | 83,072 |  |
Deferred income taxes | 4,997 |  |  |  | 38,356 |  |  |  | 4,997 | 38,356 |  |
Retained earnings | $ 14,412 |  |  |  | 1,964,115 |  |  |  | 14,412 | 1,964,115 |  |
Net sales |  |  |  |  |  |  |  |  | 36,371 |  |  |
Operating income |  |  |  |  | 13,121 |  |  |  | 6,188 |  |  |
Offshore and Other Complex Steel Structures |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contract asset - costs and profits in excess of billings |  |  |  |  | $ 16,165 |  |  |  |  | 16,165 |  |
Utility Support Structures |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 855,206 | 856,244 | 735,617 |
Operating income |  |  |  |  |  |  |  |  | 64,766 | 97,853 | 71,171 |
Engineered Support Structures |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 967,358 | 912,240 | 891,099 |
Operating income |  |  |  |  |  |  |  |  | 34,776 | 62,960 | 72,273 |
Coatings |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 256,811 | 243,877 |
Operating income |  |  |  |  |  |  |  |  | 55,325 | 50,179 | 46,596 |
Irrigation |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 624,761 | 644,372 | 567,973 |
Operating income |  |  |  |  |  |  |  |  | 97,722 | 101,498 | 90,945 |
Other |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 23,080 | 76,300 | 83,110 |
Operating income |  |  |  |  |  |  |  |  | (913) | 2,134 | $ 8,730 |
Transferred at Point in Time |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,861,641 |  |  |
Transferred at Point in Time | Utility Support Structures |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 16,760 |  |  |
Transferred at Point in Time | Engineered Support Structures |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 922,677 |  |  |
Transferred at Point in Time | Coatings |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 286,739 |  |  |
Transferred at Point in Time | Irrigation |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 612,385 |  |  |
Transferred at Point in Time | Other |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 23,080 |  |  |
Transferred over Time |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 895,503 |  |
Transferred over Time | Utility Support Structures |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 838,446 |  |
Transferred over Time | Engineered Support Structures |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 44,681 |  |
Transferred over Time | Coatings |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 0 |  |
Transferred over Time | Irrigation |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 12,376 |  |
Transferred over Time | Other |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | $ 0 |  |

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