RESTRUCTURING ACTIVITIES (Details ) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 27, 2015	Jun. 27, 2015	Apr. 25, 2015	Mar. 28, 2015	Dec. 27, 2014
Restructuring Cost and Reserve [Line Items]
Goodwill	$ 380,086	$ 380,086			$ 385,111
Restructuring costs incurred	14,273
Restructuring liabilities
Recognized Restructuring Expenses	14,273
Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Goodwill	192,548	192,548			197,074
Restructuring costs incurred	4,497
Restructuring liabilities
Recognized Restructuring Expenses	4,497
Utility Support Structures segment
Restructuring Cost and Reserve [Line Items]
Goodwill	75,404	75,404			75,404
Restructuring costs incurred	2,455
Restructuring liabilities
Recognized Restructuring Expenses	2,455
Coatings segment
Restructuring Cost and Reserve [Line Items]
Goodwill	74,228	74,228			74,862
Restructuring costs incurred	4,769
Restructuring liabilities
Recognized Restructuring Expenses	4,769
Irrigation segment
Restructuring Cost and Reserve [Line Items]
Goodwill	19,458	19,458			19,536
Restructuring costs incurred	349
Restructuring liabilities
Recognized Restructuring Expenses	349
Other/Corporate
Restructuring Cost and Reserve [Line Items]
Goodwill	18,448	18,448			$ 18,235
Restructuring costs incurred	2,203
Restructuring liabilities
Recognized Restructuring Expenses	2,203
Total Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	8,000	5,812
Restructuring liabilities
Recognized Restructuring Expenses	8,000	5,812
Costs paid or Otherwise Settled		(2,939)
Restructuring Reserve, Ending Balance	2,873	2,873
Total Cost of Sales | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	1,377
Restructuring liabilities
Recognized Restructuring Expenses	1,377
Total Cost of Sales | Utility Support Structures segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	2,050
Restructuring liabilities
Recognized Restructuring Expenses	2,050
Total Cost of Sales | Coatings segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	4,500
Restructuring liabilities
Recognized Restructuring Expenses	4,500
Total Cost of Sales | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	73
Restructuring liabilities
Recognized Restructuring Expenses	73
Total Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	6,273
Restructuring liabilities
Recognized Restructuring Expenses	6,273
Total Selling, General and Administrative Expenses | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	3,120
Restructuring liabilities
Recognized Restructuring Expenses	3,120
Total Selling, General and Administrative Expenses | Utility Support Structures segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	405
Restructuring liabilities
Recognized Restructuring Expenses	405
Total Selling, General and Administrative Expenses | Coatings segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	269
Restructuring liabilities
Recognized Restructuring Expenses	269
Total Selling, General and Administrative Expenses | Irrigation segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	349
Restructuring liabilities
Recognized Restructuring Expenses	349
Total Selling, General and Administrative Expenses | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	2,130
Restructuring liabilities
Recognized Restructuring Expenses	2,130
Broad Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	30,450	30,450
Broad Restructuring Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			$ 60,000
Broad Restructuring Plan | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	15,600	15,600
Broad Restructuring Plan | Utility Support Structures segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	4,600	4,600
Broad Restructuring Plan | Coatings segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	5,110	5,110
Goodwill	16,000	16,000
Broad Restructuring Plan | Irrigation segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1,500	1,500
Broad Restructuring Plan | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	3,640	3,640
Broad Restructuring Plan | Total Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	18,040	18,040
Broad Restructuring Plan | Total Cost of Sales | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	8,575	8,575
Broad Restructuring Plan | Total Cost of Sales | Utility Support Structures segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	3,880	3,880
Broad Restructuring Plan | Total Cost of Sales | Coatings segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	4,835	4,835
Broad Restructuring Plan | Total Cost of Sales | Irrigation segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	675	675
Broad Restructuring Plan | Total Cost of Sales | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	75	75
Broad Restructuring Plan | Total Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	12,410	12,410
Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	7,025	7,025
Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Utility Support Structures segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	720	720
Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Coatings segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	275	275
Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Irrigation segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	825	825
Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	3,565	3,565
Additional Potential Restructuring Activities
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	29,250	29,250
Additional Potential Restructuring Activities | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	7,600	7,600
Additional Potential Restructuring Activities | Coatings segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	16,000	16,000
Additional Potential Restructuring Activities | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	5,650	5,650
Additional Potential Restructuring Activities | Total Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	7,500	7,500
Additional Potential Restructuring Activities | Total Cost of Sales | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	6,500	6,500
Additional Potential Restructuring Activities | Total Cost of Sales | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1,000	1,000
Additional Potential Restructuring Activities | Total Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	21,750	21,750
Additional Potential Restructuring Activities | Total Selling, General and Administrative Expenses | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1,100	1,100
Additional Potential Restructuring Activities | Total Selling, General and Administrative Expenses | Coatings segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	16,000	16,000
Additional Potential Restructuring Activities | Total Selling, General and Administrative Expenses | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	4,650	4,650
Severance | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				$ 800
Severance | Total Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	2,298	4,927
Restructuring liabilities
Recognized Restructuring Expenses	2,298	4,927
Costs paid or Otherwise Settled		(2,294)
Restructuring Reserve, Ending Balance	2,633	2,633
Severance | Total Cost of Sales | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	535
Restructuring liabilities
Recognized Restructuring Expenses	535
Severance | Total Cost of Sales | Utility Support Structures segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	1,380
Restructuring liabilities
Recognized Restructuring Expenses	1,380
Severance | Total Cost of Sales | Coatings segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	310
Restructuring liabilities
Recognized Restructuring Expenses	310
Severance | Total Cost of Sales | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	73
Restructuring liabilities
Recognized Restructuring Expenses	73
Severance | Total Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	1,829
Restructuring liabilities
Recognized Restructuring Expenses	1,829
Severance | Total Selling, General and Administrative Expenses | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	965
Restructuring liabilities
Recognized Restructuring Expenses	965
Severance | Total Selling, General and Administrative Expenses | Utility Support Structures segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	405
Restructuring liabilities
Recognized Restructuring Expenses	405
Severance | Total Selling, General and Administrative Expenses | Irrigation segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	219
Restructuring liabilities
Recognized Restructuring Expenses	219
Severance | Total Selling, General and Administrative Expenses | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	240
Restructuring liabilities
Recognized Restructuring Expenses	240
Severance | Broad Restructuring Plan | Total Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	6,405	6,405
Severance | Broad Restructuring Plan | Total Cost of Sales | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	4,000	4,000
Severance | Broad Restructuring Plan | Total Cost of Sales | Utility Support Structures segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1,445	1,445
Severance | Broad Restructuring Plan | Total Cost of Sales | Coatings segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	460	460
Severance | Broad Restructuring Plan | Total Cost of Sales | Irrigation segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	425	425
Severance | Broad Restructuring Plan | Total Cost of Sales | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	75	75
Severance | Broad Restructuring Plan | Total Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	5,950	5,950
Severance | Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	3,900	3,900
Severance | Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Utility Support Structures segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	450	450
Severance | Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Irrigation segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	575	575
Severance | Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1,025	1,025
Severance | Additional Potential Restructuring Activities | Total Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	2,250	2,250
Severance | Additional Potential Restructuring Activities | Total Cost of Sales | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	2,000	2,000
Severance | Additional Potential Restructuring Activities | Total Cost of Sales | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	250	250
Severance | Additional Potential Restructuring Activities | Total Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1,650	1,650
Severance | Additional Potential Restructuring Activities | Total Selling, General and Administrative Expenses | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	500	500
Severance | Additional Potential Restructuring Activities | Total Selling, General and Administrative Expenses | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1,150	1,150
Other Cash Restructuring | Total Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	460	885
Restructuring liabilities
Recognized Restructuring Expenses	460	885
Costs paid or Otherwise Settled		(645)
Restructuring Reserve, Ending Balance	240	240
Other Cash Restructuring | Total Cost of Sales | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	45
Restructuring liabilities
Recognized Restructuring Expenses	45
Other Cash Restructuring | Total Cost of Sales | Utility Support Structures segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	375
Restructuring liabilities
Recognized Restructuring Expenses	375
Other Cash Restructuring | Total Cost of Sales | Coatings segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	40
Restructuring liabilities
Recognized Restructuring Expenses	40
Other Cash Restructuring | Total Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	394
Restructuring liabilities
Recognized Restructuring Expenses	394
Other Cash Restructuring | Total Selling, General and Administrative Expenses | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	125
Restructuring liabilities
Recognized Restructuring Expenses	125
Other Cash Restructuring | Total Selling, General and Administrative Expenses | Coatings segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	269
Restructuring liabilities
Recognized Restructuring Expenses	269
Other Cash Restructuring | Broad Restructuring Plan | Total Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	2,760	2,760
Other Cash Restructuring | Broad Restructuring Plan | Total Cost of Sales | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	725	725
Other Cash Restructuring | Broad Restructuring Plan | Total Cost of Sales | Utility Support Structures segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1,810	1,810
Other Cash Restructuring | Broad Restructuring Plan | Total Cost of Sales | Coatings segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	225	225
Other Cash Restructuring | Broad Restructuring Plan | Total Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	2,045	2,045
Other Cash Restructuring | Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	750	750
Other Cash Restructuring | Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Utility Support Structures segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	270	270
Other Cash Restructuring | Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Coatings segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	275	275
Other Cash Restructuring | Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Irrigation segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	100	100
Other Cash Restructuring | Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	650	650
Other Cash Restructuring | Additional Potential Restructuring Activities | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	5,000	5,000
Other Cash Restructuring | Additional Potential Restructuring Activities | Total Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	950	950
Other Cash Restructuring | Additional Potential Restructuring Activities | Total Cost of Sales | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	700	700
Other Cash Restructuring | Additional Potential Restructuring Activities | Total Cost of Sales | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	250	250
Asset Impairments/Net Loss On Disposals | Total Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	5,242
Restructuring liabilities
Recognized Restructuring Expenses	5,242
Asset Impairments/Net Loss On Disposals | Total Cost of Sales | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	797
Restructuring liabilities
Recognized Restructuring Expenses	797
Asset Impairments/Net Loss On Disposals | Total Cost of Sales | Utility Support Structures segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	295
Restructuring liabilities
Recognized Restructuring Expenses	295
Asset Impairments/Net Loss On Disposals | Total Cost of Sales | Coatings segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	4,150
Restructuring liabilities
Recognized Restructuring Expenses	4,150
Asset Impairments/Net Loss On Disposals | Total Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	4,050
Restructuring liabilities
Recognized Restructuring Expenses	4,050
Asset Impairments/Net Loss On Disposals | Total Selling, General and Administrative Expenses | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	2,030
Restructuring liabilities
Recognized Restructuring Expenses	2,030
Asset Impairments/Net Loss On Disposals | Total Selling, General and Administrative Expenses | Irrigation segment
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	130
Restructuring liabilities
Recognized Restructuring Expenses	130
Asset Impairments/Net Loss On Disposals | Total Selling, General and Administrative Expenses | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	1,890
Restructuring liabilities
Recognized Restructuring Expenses	1,890
Asset Impairments/Net Loss On Disposals | Broad Restructuring Plan | Total Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	8,875	8,875
Asset Impairments/Net Loss On Disposals | Broad Restructuring Plan | Total Cost of Sales | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	3,850	3,850
Asset Impairments/Net Loss On Disposals | Broad Restructuring Plan | Total Cost of Sales | Utility Support Structures segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	625	625
Asset Impairments/Net Loss On Disposals | Broad Restructuring Plan | Total Cost of Sales | Coatings segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	4,150	4,150
Asset Impairments/Net Loss On Disposals | Broad Restructuring Plan | Total Cost of Sales | Irrigation segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	250	250
Asset Impairments/Net Loss On Disposals | Broad Restructuring Plan | Total Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	4,415	4,415
Asset Impairments/Net Loss On Disposals | Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	2,375	2,375
Asset Impairments/Net Loss On Disposals | Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Irrigation segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	150	150
Asset Impairments/Net Loss On Disposals | Broad Restructuring Plan | Total Selling, General and Administrative Expenses | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1,890	1,890
Asset Impairments/Net Loss On Disposals | Additional Potential Restructuring Activities | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	25,000	25,000
Asset Impairments/Net Loss On Disposals | Additional Potential Restructuring Activities | Total Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	4,300	4,300
Asset Impairments/Net Loss On Disposals | Additional Potential Restructuring Activities | Total Cost of Sales | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	3,800	3,800
Asset Impairments/Net Loss On Disposals | Additional Potential Restructuring Activities | Total Cost of Sales | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	500	500
Asset Impairments/Net Loss On Disposals | Additional Potential Restructuring Activities | Total Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	20,100	20,100
Asset Impairments/Net Loss On Disposals | Additional Potential Restructuring Activities | Total Selling, General and Administrative Expenses | Engineered Infrastructure Products segment:
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	600	600
Asset Impairments/Net Loss On Disposals | Additional Potential Restructuring Activities | Total Selling, General and Administrative Expenses | Coatings segment
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	16,000	16,000
Asset Impairments/Net Loss On Disposals | Additional Potential Restructuring Activities | Total Selling, General and Administrative Expenses | Other/Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 3,500	$ 3,500