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DERIVATIVE FINANCIAL INSTRUMENTS (Details) lb in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 28, 2020 USD ($) lb | Dec. 31, 2019 USD ($) lb | Mar. 31, 2018 USD ($)
Initial Swaps | Derivative contracts designated as hedging instruments |  |  |
Derivative Financial Instruments |  |  |
Aggregate notional amount | $ 247,000,000.0 |  | $ 260,000,000.0
Initial Swaps | Derivative contracts designated as hedging instruments | Term loan |  |  |
Derivative Financial Instruments |  |  |
Fixed rate (percentage) | 2.535% |  |
Additional Swaps | Derivative contracts designated as hedging instruments |  |  |
Derivative Financial Instruments |  |  |
Aggregate notional amount | $ 248,400,000 |  |
Additional Swaps | Derivative contracts designated as hedging instruments | Term loan |  |  |
Derivative Financial Instruments |  |  |
Fixed rate (percentage) | 1.061% |  |
Swaps |  |  |
Derivative Financial Instruments |  |  |
Unrealized gain (loss) recorded in AOCI | $ (6,600,000) | $ (1,900,000) |
Swaps | Derivative contracts designated as hedging instruments |  |  |
Derivative Financial Instruments |  |  |
Derivative fair value | (8,800,000) | (2,500,000) |
FX Forward Contracts |  |  |
Derivative Financial Instruments |  |  |
Aggregate notional amount | 8,500,000 | 26,000,000.0 |
Commodity Contracts |  |  |
Derivative Financial Instruments |  |  |
Unrealized gain (loss) recorded in AOCI | (1,400,000) | 300,000 |
Fair value of derivative contract - liability | $ 1,800,000 |  |
Fair value of derivative contract - asset |  | $ 400,000 |
Commodity Contracts | Derivative contracts designated as hedging instruments |  |  |
Derivative Financial Instruments |  |  |
Notional amount of commodity contracts (in pounds of copper) | lb | 3.5 | 3.4 |

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