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RESTRUCTURING ACTIVITIES (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 29, 2019 facility | Sep. 29, 2018 USD ($) | Dec. 29, 2018 USD ($) facility | Dec. 30, 2017 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Goodwill impairment |  | $ 14,355 | $ 14,355 | $ 34,892
Broad Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | $ 4,581 |
Facility Closing [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number Of Facilities Closed | facility |  |  | 7 |
ESS | Restructuring Asset Impairment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  | $ 8 |
Coatings Segment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Goodwill impairment |  |  | 14,355 | 0
Engineered Support Structures |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Goodwill impairment |  |  | 0 | 18,670
Coatings |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Goodwill impairment |  |  | 0 | 16,222
Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Goodwill impairment |  |  | 0 | 0
Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Goodwill impairment |  |  | 0 | $ 0
Selling, General and Administrative Expenses | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 7,825 |
Selling, General and Administrative Expenses | Severance | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 585 |
Selling, General and Administrative Expenses | Other cash restructuring expenses | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 2,195 |
Selling, General and Administrative Expenses | Asset impairments/net loss on disposals | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 2,780 |
Selling, General and Administrative Expenses | Engineered Support Structures | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 7,286 |
Selling, General and Administrative Expenses | Engineered Support Structures | Broad Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 1,040 |
Selling, General and Administrative Expenses | Engineered Support Structures | Severance | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 349 |
Selling, General and Administrative Expenses | Engineered Support Structures | Other cash restructuring expenses | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 1,961 |
Selling, General and Administrative Expenses | Engineered Support Structures | Asset impairments/net loss on disposals | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 2,310 |
Selling, General and Administrative Expenses | Coatings | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 305 |
Selling, General and Administrative Expenses | Coatings | Broad Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 602 |
Selling, General and Administrative Expenses | Coatings | Severance | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 236 |
Selling, General and Administrative Expenses | Coatings | Other cash restructuring expenses | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 0 |
Selling, General and Administrative Expenses | Coatings | Asset impairments/net loss on disposals | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 236 |
Selling, General and Administrative Expenses | Other | Broad Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 468 |
Selling, General and Administrative Expenses | Other | Broad Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 1,943 |
Selling, General and Administrative Expenses | Other/ Corporate | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 234 |
Selling, General and Administrative Expenses | Other/ Corporate | Severance | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 0 |
Selling, General and Administrative Expenses | Other/ Corporate | Other cash restructuring expenses | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 234 |
Selling, General and Administrative Expenses | Other/ Corporate | Asset impairments/net loss on disposals | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 234 |
Cost of Sales | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 5,045 |
Cost of Sales | Severance | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 1,689 |
Cost of Sales | Other cash restructuring expenses | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 2,257 |
Cost of Sales | Asset impairments/net loss on disposals | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 1,099 |
Cost of Sales | Coatings Segment | Broad Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 528 |
Cost of Sales | Engineered Support Structures | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 4,976 |
Cost of Sales | Engineered Support Structures | Severance | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 1,620 |
Cost of Sales | Engineered Support Structures | Other cash restructuring expenses | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 2,257 |
Cost of Sales | Engineered Support Structures | Asset impairments/net loss on disposals | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 1,099 |
Cost of Sales | Coatings | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 69 |
Cost of Sales | Coatings | Severance | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 69 |
Cost of Sales | Coatings | Other cash restructuring expenses | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 0 |
Cost of Sales | Coatings | Asset impairments/net loss on disposals | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 0 |
Cost of Sales | Other/ Corporate | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 0 |
Cost of Sales | Other/ Corporate | Severance | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 0 |
Cost of Sales | Other/ Corporate | Other cash restructuring expenses | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | 0 |
Cost of Sales | Other/ Corporate | Asset impairments/net loss on disposals | 2016 Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost remaining |  |  | $ 0 |
CHINA | Facility Closing [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number Of Facilities Closed | facility |  |  | 3 |
Scenario, Forecast | ESS | Facility Closing [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number Of Facilities Closed | facility | 1 |  |  |
Scenario, Forecast | Utility Support Structures Segment | Facility Closing [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number Of Facilities Closed | facility | 1 |  |  |

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