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DERIVATIVE FINANCIAL INSTRUMENTS (Details) lb in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 27, 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 | $ 243,800,000 |  | $ 260,000,000.0
Fixed rate (percentage) | 2.535% |  |
Additional Swaps | Derivative contracts designated as hedging instruments |  |  |
Derivative Financial Instruments |  |  |
Aggregate notional amount | $ 248,400,000 |  |
Fixed rate (percentage) | 1.061% |  |
Swaps |  |  |
Derivative Financial Instruments |  |  |
Unrealized gain (loss) recorded in AOCI | $ (8,400,000) | $ (1,900,000) |
Swaps | Derivative contracts designated as hedging instruments |  |  |
Derivative Financial Instruments |  |  |
Derivative fair value | (11,100,000) |  |
Swaps | Derivative contracts designated as hedging instruments | Short-term Liability |  |  |
Derivative Financial Instruments |  |  |
Derivative fair value | (5,000,000.0) |  |
Swaps | Derivative contracts designated as hedging instruments | Long-term Liability |  |  |
Derivative Financial Instruments |  |  |
Derivative fair value |  | (2,500,000) |
FX Forward Contracts |  |  |
Derivative Financial Instruments |  |  |
Aggregate notional amount | 10,100,000 | 26,000,000.0 |
Commodity Contracts |  |  |
Derivative Financial Instruments |  |  |
Unrealized gain (loss) recorded in AOCI | 400,000 | 300,000 |
Fair value of derivative contract - asset | $ 500,000 | $ 400,000 |
Commodity Contracts | Derivative contracts designated as hedging instruments |  |  |
Derivative Financial Instruments |  |  |
Notional amount of commodity contracts (in pounds of copper) | lb | 3.9 | 3.4 |

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