RESTRUCTURING ACTIVITIES (Details 2) - Broad Restructuring Plan - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining	$ 4,581	$ 39,852
Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		21,708
Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		18,144
Severance | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		7,204
Severance | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		6,719
Other cash restructuring expenses | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		4,377
Other cash restructuring expenses | 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 | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		10,127
Asset impairments/net loss on disposals | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		9,709
Engineered Support Structures
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		16,348
Engineered Support Structures | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		10,460
Engineered Support Structures | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining	1,040	5,888
Engineered Support Structures | Severance | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		4,417
Engineered Support Structures | Severance | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		3,665
Engineered Support Structures | Other cash restructuring expenses | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		2,349
Engineered Support Structures | Other cash restructuring expenses | 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 | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		3,694
Engineered Support Structures | Asset impairments/net loss on disposals | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		2,223
Utility
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		5,192
Utility | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining	528	4,550
Utility | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		642
Utility | Severance | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		1,555
Utility | Severance | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		404
Utility | Other cash restructuring expenses | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		1,853
Utility | Other cash restructuring expenses | 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 | 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 | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Coatings
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		6,580
Coatings | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		5,974
Coatings | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining	602	606
Coatings | Severance | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		508
Coatings | Severance | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		270
Coatings | Other cash restructuring expenses | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		175
Coatings | Other cash restructuring expenses | 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 | 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 | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Irrigation
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		1,277
Irrigation | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		724
Irrigation | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining	468	553
Irrigation | Severance | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		724
Irrigation | Severance | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		423
Irrigation | Other cash restructuring expenses | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Irrigation | Other cash restructuring expenses | 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 | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Irrigation | Asset impairments/net loss on disposals | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		130
Other
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		10,455
Other | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Other | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining	$ 1,943	10,455
Other | Severance | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Other | Severance | 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 | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Other | Other cash restructuring expenses | 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 | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
Other | Asset impairments/net loss on disposals | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		$ 7,356