RESTRUCTURING ACTIVITIES (Details 2) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		$ 11,500	$ 6,300
Broad Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining	$ 4,581	39,852		$ 9,800
Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		21,708
Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		18,144
Severance | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		7,204
Severance | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		6,719
Other cash restructuring expenses | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		4,377
Other cash restructuring expenses | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		1,716
Asset impairments/net loss on disposals | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		10,127
Asset impairments/net loss on disposals | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		9,709
Engineered Support Structures | Broad Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		9,279
Engineered Support Structures | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		4,105
Engineered Support Structures | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining	1,040	5,174
Engineered Support Structures | Severance | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		2,305
Engineered Support Structures | Severance | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		2,951
Engineered Support Structures | Other cash restructuring expenses | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		1,467
Engineered Support Structures | Other cash restructuring expenses | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Engineered Support Structures | Asset impairments/net loss on disposals | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		333
Engineered Support Structures | Asset impairments/net loss on disposals | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		2,223
Energy and Mining Segment | Broad Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		7,069
Energy and Mining Segment | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		6,355
Energy and Mining Segment | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		714
Energy and Mining Segment | Severance | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		2,112
Energy and Mining Segment | Severance | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		714
Energy and Mining Segment | Other cash restructuring expenses | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		882
Energy and Mining Segment | Other cash restructuring expenses | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Energy and Mining Segment | Asset impairments/net loss on disposals | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		3,361
Energy and Mining Segment | Asset impairments/net loss on disposals | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Utility | Broad Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		5,192
Utility | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining	528	4,550
Utility | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		642
Utility | Severance | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		1,555
Utility | Severance | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		404
Utility | Other cash restructuring expenses | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		1,853
Utility | Other cash restructuring expenses | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		238
Utility | Asset impairments/net loss on disposals | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		1,142
Utility | Asset impairments/net loss on disposals | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Coatings | Broad Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		6,580
Coatings | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		5,974
Coatings | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining	602	606
Coatings | Severance | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		508
Coatings | Severance | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		270
Coatings | Other cash restructuring expenses | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		175
Coatings | Other cash restructuring expenses | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		336
Coatings | Asset impairments/net loss on disposals | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		5,291
Coatings | Asset impairments/net loss on disposals | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Irrigation | Broad Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		1,277
Irrigation | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		724
Irrigation | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining	468	553
Irrigation | Severance | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		724
Irrigation | Severance | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		423
Irrigation | Other cash restructuring expenses | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Irrigation | Other cash restructuring expenses | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Irrigation | Asset impairments/net loss on disposals | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Irrigation | Asset impairments/net loss on disposals | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		130
Other | Broad Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		10,455
Other | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Other | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining	$ 1,943	10,455
Other | Severance | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Other | Severance | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		1,957
Other | Other cash restructuring expenses | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Other | Other cash restructuring expenses | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		1,142
Other | Asset impairments/net loss on disposals | Broad Restructuring Plan | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Other | Asset impairments/net loss on disposals | Broad Restructuring Plan | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		$ 7,356