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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Change from LIFO to FIFO on Statement of Earnings (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019
Income Statement Impact [Abstract] |  |  |  |
Cost of sales | $ 504,871 | $ 522,695 | $ 992,822 | $ 1,050,207
Operating income | 43,440 | 61,474 | 110,335 | 116,076
Income tax expense | 12,602 | 13,401 | 27,088 | 25,703
Net earnings attributable to Valmont Industries, Inc. | 22,607 | 39,719 | 65,536 | 75,823
Comprehensive income | $ 38,119 | $ 36,370 | $ 46,899 | $ 78,028
Net earnings per diluted share (in dollars per share) | $ 1.06 | $ 1.82 | $ 3.05 | $ 3.46
As Previously Reported |  |  |  |
Income Statement Impact [Abstract] |  |  |  |
Cost of sales |  | $ 520,457 |  | $ 1,047,467
Operating income |  | 63,712 |  | 118,816
Income tax expense |  | 13,961 |  | 26,388
Net earnings attributable to Valmont Industries, Inc. |  | 41,397 |  | 77,878
Comprehensive income |  | $ 38,048 |  | $ 80,083
Net earnings per diluted share (in dollars per share) |  | $ 1.90 |  | $ 3.56
Adjustment |  |  |  |
Income Statement Impact [Abstract] |  |  |  |
Cost of sales |  | $ 2,238 |  | $ 2,740
Operating income |  | (2,238) |  | (2,740)
Income tax expense |  | (560) |  | (685)
Net earnings attributable to Valmont Industries, Inc. |  | (1,679) |  | (2,055)
Comprehensive income |  | $ (1,679) |  | $ (2,055)
Net earnings per diluted share (in dollars per share) |  | $ (0.08) |  | $ (0.10)

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