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GUARANTOR/NON-GUARANTOR FINANCIAL INFORMATION - Condensed Consolidated Statements of Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 24, 2016 | Sep. 26, 2015 | Sep. 24, 2016 | Sep. 26, 2015
GUARANTOR/NON-GUARANTOR FINANCIAL INFORMATION |  |  |  |
Parent company's percentage ownership of Guarantors | 100.00% |  | 100.00% |
Condensed consolidated financial information for the Company (Parent), the guarantor subsidiaries and the non-guarantor subsidiaries |  |  |  |
Net sales | $ 610,247 | $ 632,575 | $ 1,847,101 | $ 1,985,096
Cost of sales | 455,224 | 475,824 | 1,355,992 | 1,493,343
Gross profit | 155,023 | 156,751 | 491,109 | 491,753
Selling, general and administrative expenses | 101,783 | 104,539 | 303,698 | 327,858
Impairment of goodwill and intangible assets | 0 | 15,200 | 0 | 15,200
Operating income | 53,240 | 37,012 | 187,411 | 148,695
Other income (expense): |  |  |  |
Interest expense | (11,100) | (11,120) | (33,276) | (33,480)
Interest income | 771 | 905 | 2,289 | 2,395
Other | 878 | (1,230) | 452 | (242)
Total other income (expenses) | (9,451) | (11,445) | (30,535) | (31,327)
Earnings before income taxes | 43,789 | 25,567 | 156,876 | 117,368
Income tax expense (benefit): |  |  |  |
Current | 18,017 | 6,746 | 51,276 | 37,656
Deferred income taxes | (3,749) | 5,272 | (1,534) | 5,217
Total income tax expense (benefit) | 14,268 | 12,018 | 49,742 | 42,873
Earnings before equity in earnings of nonconsolidated subsidiaries | 29,521 | 13,549 | 107,134 | 74,495
Equity in earnings of nonconsolidated subsidiaries | 0 | 0 | 0 | 0
Net earnings | 29,521 | 13,549 | 107,134 | 74,495
Less: Earnings attributable to noncontrolling interests | (1,348) | (1,483) | (3,966) | (3,817)
Net earnings attributable to Valmont Industries, Inc. | 28,173 | 12,066 | 103,168 | 70,678
Parent |  |  |  |
Condensed consolidated financial information for the Company (Parent), the guarantor subsidiaries and the non-guarantor subsidiaries |  |  |  |
Net sales | 261,928 | 249,121 | 837,137 | 889,408
Cost of sales | 199,957 | 191,143 | 619,493 | 673,789
Gross profit | 61,971 | 57,978 | 217,644 | 215,619
Selling, general and administrative expenses | 46,183 | 44,432 | 133,207 | 143,387
Impairment of goodwill and intangible assets |  | 0 |  | 0
Operating income | 15,788 | 13,546 | 84,437 | 72,232
Other income (expense): |  |  |  |
Interest expense | (10,920) | (10,822) | (32,768) | (32,548)
Interest income | 68 | (9) | 181 | 4
Other | 1,370 | (2,123) | 1,694 | (3,020)
Total other income (expenses) | (9,482) | (12,954) | (30,893) | (35,564)
Earnings before income taxes | 6,306 | 592 | 53,544 | 36,668
Income tax expense (benefit): |  |  |  |
Current | 6,112 | (9,059) | 22,086 | (122)
Deferred income taxes | (5,321) | 7,909 | (1,834) | 11,728
Total income tax expense (benefit) | 791 | (1,150) | 20,252 | 11,606
Earnings before equity in earnings of nonconsolidated subsidiaries | 5,515 | 1,742 | 33,292 | 25,062
Equity in earnings of nonconsolidated subsidiaries | 22,658 | 10,324 | 69,876 | 45,616
Net earnings | 28,173 | 12,066 | 103,168 | 70,678
Less: Earnings attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net earnings attributable to Valmont Industries, Inc. | 28,173 | 12,066 | 103,168 | 70,678
Guarantors |  |  |  |
Condensed consolidated financial information for the Company (Parent), the guarantor subsidiaries and the non-guarantor subsidiaries |  |  |  |
Net sales | 89,305 | 114,766 | 277,990 | 312,804
Cost of sales | 66,401 | 82,848 | 205,497 | 235,893
Gross profit | 22,904 | 31,918 | 72,493 | 76,911
Selling, general and administrative expenses | 11,073 | 11,154 | 33,583 | 33,542
Impairment of goodwill and intangible assets |  | 0 |  | 0
Operating income | 11,831 | 20,764 | 38,910 | 43,369
Other income (expense): |  |  |  |
Interest expense | (6) | 0 | (9) | 0
Interest income | 12 | 2 | 51 | 6
Other | 12 | 31 | 39 | 31
Total other income (expenses) | 18 | 33 | 81 | 37
Earnings before income taxes | 11,849 | 20,797 | 38,991 | 43,406
Income tax expense (benefit): |  |  |  |
Current | 5,095 | 8,423 | 13,909 | 18,273
Deferred income taxes | 0 | (478) | 0 | (1,062)
Total income tax expense (benefit) | 5,095 | 7,945 | 13,909 | 17,211
Earnings before equity in earnings of nonconsolidated subsidiaries | 6,754 | 12,852 | 25,082 | 26,195
Equity in earnings of nonconsolidated subsidiaries | 0 | 1,254 | 7,859 | 6,435
Net earnings | 6,754 | 14,106 | 32,941 | 32,630
Less: Earnings attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net earnings attributable to Valmont Industries, Inc. | 6,754 | 14,106 | 32,941 | 32,630
Non- Guarantors |  |  |  |
Condensed consolidated financial information for the Company (Parent), the guarantor subsidiaries and the non-guarantor subsidiaries |  |  |  |
Net sales | 300,648 | 321,726 | 873,673 | 946,517
Cost of sales | 230,561 | 255,424 | 671,202 | 747,075
Gross profit | 70,087 | 66,302 | 202,471 | 199,442
Selling, general and administrative expenses | 44,527 | 48,953 | 136,908 | 150,929
Impairment of goodwill and intangible assets |  | 15,200 |  | 15,200
Operating income | 25,560 | 2,149 | 65,563 | 33,313
Other income (expense): |  |  |  |
Interest expense | (174) | (298) | (499) | (932)
Interest income | 691 | 912 | 2,057 | 2,385
Other | (504) | 862 | (1,281) | 2,747
Total other income (expenses) | 13 | 1,476 | 277 | 4,200
Earnings before income taxes | 25,573 | 3,625 | 65,840 | 37,513
Income tax expense (benefit): |  |  |  |
Current | 6,762 | 7,226 | 15,762 | 19,570
Deferred income taxes | 1,572 | (2,159) | 300 | (5,449)
Total income tax expense (benefit) | 8,334 | 5,067 | 16,062 | 14,121
Earnings before equity in earnings of nonconsolidated subsidiaries | 17,239 | (1,442) | 49,778 | 23,392
Equity in earnings of nonconsolidated subsidiaries | 0 | 0 | 0 | 0
Net earnings | 17,239 | (1,442) | 49,778 | 23,392
Less: Earnings attributable to noncontrolling interests | (1,348) | (1,483) | (3,966) | (3,817)
Net earnings attributable to Valmont Industries, Inc. | 15,891 | (2,925) | 45,812 | 19,575
Eliminations |  |  |  |
Condensed consolidated financial information for the Company (Parent), the guarantor subsidiaries and the non-guarantor subsidiaries |  |  |  |
Net sales | (41,634) | (53,038) | (141,699) | (163,633)
Cost of sales | (41,695) | (53,591) | (140,200) | (163,414)
Gross profit | 61 | 553 | (1,499) | (219)
Selling, general and administrative expenses | 0 | 0 | 0 | 0
Impairment of goodwill and intangible assets |  | 0 |  | 0
Operating income | 61 | 553 | (1,499) | (219)
Other income (expense): |  |  |  |
Interest expense | 0 | 0 | 0 | 0
Interest income | 0 | 0 | 0 | 0
Other | 0 | 0 | 0 | 0
Total other income (expenses) | 0 | 0 | 0 | 0
Earnings before income taxes | 61 | 553 | (1,499) | (219)
Income tax expense (benefit): |  |  |  |
Current | 48 | 156 | (481) | (65)
Deferred income taxes | 0 | 0 | 0 | 0
Total income tax expense (benefit) | 48 | 156 | (481) | (65)
Earnings before equity in earnings of nonconsolidated subsidiaries | 13 | 397 | (1,018) | (154)
Equity in earnings of nonconsolidated subsidiaries | (22,658) | (11,578) | (77,735) | (52,051)
Net earnings | (22,645) | (11,181) | (78,753) | (52,205)
Less: Earnings attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net earnings attributable to Valmont Industries, Inc. | $ (22,645) | $ (11,181) | $ (78,753) | $ (52,205)

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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The parent's direct and indirect ownership percentage of the subsidiaries that are guarantors of the entity's debt. + References No definition available. + Details
Name: | vmi_SubsidiaryGuarantorsPercentageOwned
Namespace Prefix: | vmi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=us-gaap_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=us-gaap_GuarantorSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=us-gaap_NonGuarantorSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=us-gaap_ConsolidationEliminationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |