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RESTRUCTURING ACTIVITIES - Restructuring Activities - Restruciting Expenses and Related Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 29, 2018
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | $ 4,400 |
ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 3,628 |
Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 772 |
Total cost of sales |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 2,340 |
Total cost of sales | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,568 | $ 23,515
Total cost of sales | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 772 |
Selling, General and Administrative Expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 2,060 |
Selling, General and Administrative Expenses | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 2,060 | $ 18,460
Selling, General and Administrative Expenses | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 |
Severance | Total cost of sales |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 423 |
Severance | Total cost of sales | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 423 |
Severance | Total cost of sales | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 |
Severance | Selling, General and Administrative Expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,978 |
Severance | Selling, General and Administrative Expenses | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,978 |
Severance | Selling, General and Administrative Expenses | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 |
Other cash restructuring expenses | Total cost of sales |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 772 |
Other cash restructuring expenses | Total cost of sales | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 |
Other cash restructuring expenses | Total cost of sales | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 772 |
Other cash restructuring expenses | Selling, General and Administrative Expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 82 |
Other cash restructuring expenses | Selling, General and Administrative Expenses | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 82 |
Other cash restructuring expenses | Selling, General and Administrative Expenses | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 |
Asset impairments/net loss on disposals | Total cost of sales |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,145 |
Asset impairments/net loss on disposals | Total cost of sales | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,145 |
Asset impairments/net loss on disposals | Total cost of sales | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | $ 0 |

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