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BUSINESS SEGMENTS (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 30, 2013 item | Mar. 31, 2012
Business Segments |  |
Number of reportable segments | 4 |
Maximum percentage of sales of other businesses and activities to consolidated sales as basis for aggregation | 10.00% |
Sales | $ 875,129 | $ 760,335
Intersegment Sales | 55,499 | 42,985
Net sales | 819,630 | 717,350
Operating income | 118,190 | 82,818
Lighting, Traffic, and Roadway Products |  |
Business Segments |  |
Sales | 147,170 | 139,325
Communication Products |  |
Business Segments |  |
Sales | 28,622 | 26,695
Access Systems |  |
Business Segments |  |
Sales | 47,878 | 37,907
Steel |  |
Business Segments |  |
Sales | 210,497 | 166,964
Concrete |  |
Business Segments |  |
Sales | 29,141 | 24,268
Engineered Infrastructure Products segment: |  |
Business Segments |  |
Sales | 223,670 | 203,927
Intersegment Sales | 29,452 | 18,420
Net sales | 194,218 | 185,507
Operating income | 12,734 | 8,024
Utility Support Structures segment |  |
Business Segments |  |
Sales | 239,638 | 191,232
Intersegment Sales | 411 | 1,980
Net sales | 239,227 | 189,252
Operating income | 46,155 | 25,104
Coatings segment |  |
Business Segments |  |
Sales | 89,245 | 82,847
Intersegment Sales | 14,330 | 12,697
Net sales | 74,915 | 70,150
Operating income | 13,420 | 16,512
Irrigation segment |  |
Business Segments |  |
Sales | 244,707 | 196,266
Intersegment Sales |  | 425
Net sales | 244,707 | 195,841
Operating income | 54,559 | 38,408
Other |  |
Business Segments |  |
Sales | 77,869 | 86,063
Intersegment Sales | 11,306 | 9,463
Net sales | 66,563 | 76,600
Operating income | 10,787 | 11,411
Net corporate expense |  |
Business Segments |  |
Operating income | $ (19,465) | $ (16,641)

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Definition Amount of revenue from transactions with other operating segments of the same entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Definition The maximum percentage of sales of individual business activities to total consolidated sales of operating segments that do not meet the quantitative thresholds and thus are not classified as reportable segments. + References No definition available. + Details
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