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GUARANTOR/NON-GUARANTOR FINANCIAL INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 29, 2012 | Sep. 29, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 24, 2011 | Jun. 25, 2011 | Mar. 26, 2011 | Dec. 29, 2012 | Dec. 31, 2011 | Dec. 25, 2010
Condensed consolidated financial information for the Company (Parent), the guarantor subsidiaries and the non-guarantor subsidiaries |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 815,037 | $ 729,839 | $ 767,315 | $ 717,350 | $ 752,730 | $ 672,192 | $ 668,609 | $ 567,949 | $ 3,029,541 | $ 2,661,480 | $ 1,975,505
Cost of sales |  |  |  |  |  |  |  |  | 2,227,085 | 1,994,670 | 1,455,931
Gross profit | 224,345 | 192,402 | 199,395 | 186,314 | 194,945 | 167,390 | 167,982 | 136,493 | 802,456 | 666,810 | 519,574
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 420,160 | 403,500 | 341,161
Operating income |  |  |  |  |  |  |  |  | 382,296 | 263,310 | 178,413
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (31,625) | (36,175) | (30,947)
Interest income |  |  |  |  |  |  |  |  | 8,272 | 9,265 | 4,840
Other |  |  |  |  |  |  |  |  | 347 | (2,643) | 676
Total other income (expenses) |  |  |  |  |  |  |  |  | (23,006) | (29,553) | (25,431)
Earnings before income taxes and equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 359,290 | 233,757 | 152,982
Income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 122,782 | 89,552 | 49,991
Deferred |  |  |  |  |  |  |  |  | 3,720 | (84,962) | 5,017
Total income tax expense (benefit) |  |  |  |  |  |  |  |  | 126,502 | 4,590 | 55,008
Earnings before equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 232,788 | 229,167 | 97,974
Equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 6,128 | 8,059 | 2,439
Net earnings |  |  |  |  |  |  |  |  | 238,916 | 237,226 | 100,413
Less: Earnings attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (4,844) | (8,918) | (6,034)
Net earnings attributable to Valmont Industries, Inc. | 65,036 | 56,731 | 59,980 | 52,325 | 114,731 | 42,141 | 45,827 | 25,609 | 234,072 | 228,308 | 94,379
Parent |  |  |  |  |  |  |  |  |  |  |
Condensed consolidated financial information for the Company (Parent), the guarantor subsidiaries and the non-guarantor subsidiaries |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,375,238 | 1,164,400 | 847,396
Cost of sales |  |  |  |  |  |  |  |  | 1,008,087 | 863,269 | 622,018
Gross profit |  |  |  |  |  |  |  |  | 367,151 | 301,131 | 225,378
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 178,669 | 166,964 | 147,054
Operating income |  |  |  |  |  |  |  |  | 188,482 | 134,167 | 78,324
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (31,121) | (35,456) | (30,282)
Interest income |  |  |  |  |  |  |  |  | 45 | 59 | 127
Other |  |  |  |  |  |  |  |  | 1,938 | (311) | 995
Total other income (expenses) |  |  |  |  |  |  |  |  | (29,138) | (35,708) | (29,160)
Earnings before income taxes and equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 159,344 | 98,459 | 49,164
Income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 59,648 | 48,243 | 19,525
Deferred |  |  |  |  |  |  |  |  | (4,721) | (4,787) | 722
Total income tax expense (benefit) |  |  |  |  |  |  |  |  | 54,927 | 43,456 | 20,247
Earnings before equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 104,417 | 55,003 | 28,917
Equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 129,655 | 173,305 | 65,462
Net earnings |  |  |  |  |  |  |  |  | 234,072 | 228,308 | 94,379
Net earnings attributable to Valmont Industries, Inc. |  |  |  |  |  |  |  |  | 234,072 | 228,308 | 94,379
Guarantors |  |  |  |  |  |  |  |  |  |  |
Condensed consolidated financial information for the Company (Parent), the guarantor subsidiaries and the non-guarantor subsidiaries |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 620,338 | 401,443 | 304,309
Cost of sales |  |  |  |  |  |  |  |  | 489,560 | 323,812 | 231,696
Gross profit |  |  |  |  |  |  |  |  | 130,778 | 77,631 | 72,613
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 55,488 | 50,783 | 47,688
Operating income |  |  |  |  |  |  |  |  | 75,290 | 26,848 | 24,925
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (49,762) |  | (1)
Interest income |  |  |  |  |  |  |  |  | 1,131 | 331 | 31
Other |  |  |  |  |  |  |  |  | 55 | 59 | (48)
Total other income (expenses) |  |  |  |  |  |  |  |  | (48,576) | 390 | (18)
Earnings before income taxes and equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 26,714 | 27,238 | 24,907
Income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 16,398 | 10,571 | 5,039
Deferred |  |  |  |  |  |  |  |  | (496) | (964) | 4,984
Total income tax expense (benefit) |  |  |  |  |  |  |  |  | 15,902 | 9,607 | 10,023
Earnings before equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 10,812 | 17,631 | 14,884
Equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 86,170 | 125,269 | 25,264
Net earnings |  |  |  |  |  |  |  |  | 96,982 | 142,900 | 40,148
Net earnings attributable to Valmont Industries, Inc. |  |  |  |  |  |  |  |  | 96,982 | 142,900 | 40,148
Non-Guarantors |  |  |  |  |  |  |  |  |  |  |
Condensed consolidated financial information for the Company (Parent), the guarantor subsidiaries and the non-guarantor subsidiaries |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,331,827 | 1,305,424 | 956,023
Cost of sales |  |  |  |  |  |  |  |  | 1,026,037 | 1,016,305 | 735,195
Gross profit |  |  |  |  |  |  |  |  | 305,790 | 289,119 | 220,828
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 186,003 | 185,753 | 146,419
Operating income |  |  |  |  |  |  |  |  | 119,787 | 103,366 | 74,409
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (504) | (719) | (664)
Interest income |  |  |  |  |  |  |  |  | 56,858 | 8,875 | 4,682
Other |  |  |  |  |  |  |  |  | (1,646) | (2,391) | (271)
Total other income (expenses) |  |  |  |  |  |  |  |  | 54,708 | 5,765 | 3,747
Earnings before income taxes and equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 174,495 | 109,131 | 78,156
Income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 47,375 | 30,738 | 25,427
Deferred |  |  |  |  |  |  |  |  | 8,937 | (79,211) | (689)
Total income tax expense (benefit) |  |  |  |  |  |  |  |  | 56,312 | (48,473) | 24,738
Earnings before equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 118,183 | 157,604 | 53,418
Equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 5,150 | 6,818 | 1,525
Net earnings |  |  |  |  |  |  |  |  | 123,333 | 164,422 | 54,943
Less: Earnings attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (4,844) | (8,918) | (6,034)
Net earnings attributable to Valmont Industries, Inc. |  |  |  |  |  |  |  |  | 118,489 | 155,504 | 48,909
Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed consolidated financial information for the Company (Parent), the guarantor subsidiaries and the non-guarantor subsidiaries |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (297,862) | (209,787) | (132,223)
Cost of sales |  |  |  |  |  |  |  |  | (296,599) | (208,716) | (132,978)
Gross profit |  |  |  |  |  |  |  |  | (1,263) | (1,071) | 755
Operating income |  |  |  |  |  |  |  |  | (1,263) | (1,071) | 755
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 49,762 |  |
Interest income |  |  |  |  |  |  |  |  | (49,762) |  |
Earnings before income taxes and equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | (1,263) | (1,071) | 755
Income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | (639) |  |
Total income tax expense (benefit) |  |  |  |  |  |  |  |  | (639) |  |
Earnings before equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | (624) | (1,071) | 755
Equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | (214,847) | (297,333) | (89,812)
Net earnings |  |  |  |  |  |  |  |  | (215,471) | (298,404) | (89,057)
Net earnings attributable to Valmont Industries, Inc. |  |  |  |  |  |  |  |  | $ (215,471) | $ (298,404) | $ (89,057)

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