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EARNINGS PER SHARE (Details 2) - USD ($) | 3 Months Ended | 9 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 | Sep. 30, 2017 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill & intangible assets |  |  |  |  |  |  |  |  |  | $ 15,780,000 | $ 0 | $ 0
Net earnings attributable to Valmont Industries, Inc. | $ 17,662,000 | $ 4,448,000 | $ 32,960,000 | $ 39,281,000 | $ (3,611,000) | $ 35,208,000 | $ 45,664,000 | $ 38,979,000 |  | $ 94,351,000 | $ 116,240,000 | $ 173,232,000
Basic (in dollars per share) | $ 0.80 | $ 0.20 | $ 1.47 | $ 1.74 | $ (0.16) | $ 1.56 | $ 2.03 | $ 1.73 | $ 5.16 | $ 4.23 | $ 5.16 | $ 7.68
Refinancing of long-term debt expense |  |  |  |  |  |  |  |  |  | $ 11,115,000 |  |
Refinancing of long-term debt expense (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.50 |  |
Blended tax rate (percent) | 25.00% |  |  |  |  |  |  |  |  | 21.00% | 35.00% | 35.00%
Deferred income tax expense | $ 20,372,000 |  |  |  |  |  |  |  |  |  | $ 20,372,000 |
Deferred income tax expense (in usd per share) | $ 0.90 |  |  |  |  |  |  |  |  |  |  |
Provision charge for deemed repatriation tax | $ 9,890,000 |  |  |  |  |  |  |  |  |  |  |
Provision charge for deemed repatriation tax (in usd per share) | $ 0.44 |  |  |  |  |  |  |  |  |  |  |
Deferred expenses related to foreign withholding taxes and US state income taxes | $ 11,673,000 |  |  |  |  |  |  |  |  | $ (1,881,000) | $ 49,766,000 | $ (32,391,000)
Deferred expenses related to foreign withholding taxes and US state income taxes (in usd per share) | $ 0.51 |  |  |  |  |  |  |  |  |  |  |
Deferred income tax benefit |  |  |  |  |  |  |  |  |  | $ 30,590,000 |  |
Deferred income tax benefit (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.35 |  |
Provision for valuation allowance |  |  |  |  |  |  |  |  |  | $ 9,888,000 |  |
Valuation provision effect (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.44 |  |
Reversal of contingent liability |  |  |  |  |  |  |  |  |  | $ 16,591,000 |  |
Reversal of contingent liability effect (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.73 |  |
Restructuring expenses |  |  |  |  |  |  |  |  |  | $ 34,031,000 |  |
Outstanding stock options with exercise prices exceeding the market price of common stock, excluded from the computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 0 | 406,806 |  | 197,303
Goodwill And Indefinite-lived Intangible Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill & intangible assets |  |  |  |  |  |  |  |  |  | $ 14,736,000 |  |
Impairment of goodwill and intangible assets (in dollars per share |  |  |  |  |  |  |  |  |  | $ 0.66 |  |
2018 Restructuring Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to Valmont Industries, Inc. |  |  |  |  |  |  |  |  |  | $ (37,779,000) |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (1.68) |  |
Disposed by sale | Donhad |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to Valmont Industries, Inc. |  |  |  |  |  |  |  |  |  | $ 5,350,000 |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.24 |  |

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