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RESTRUCTURING (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 26, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019 | Mar. 28, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and turnaround costs | $ 4,440 | $ 3,757 | $ 8,440 | $ 5,784 |
Restructuring liability | 1,680 |  | 1,680 |  | $ 2,648
Restructuring liability payable in next twelve months | 1,200 |  | 1,200 |  |
Turnaround costs | 4,513 | 2,414 | 7,448 | 3,472 |
2020 Program |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and turnaround costs | 4,400 | 2,900 | 8,000 | 2,900 |
Cumulative costs to date | 19,800 |  | 19,800 |  |
Restructuring liability | 1,091 |  | 1,091 |  | $ 1,136
2020 Program | Minimum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected cost | 60,000 |  | 60,000 |  |
2020 Program | Maximum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected cost | 70,000 |  | 70,000 |  |
2018 Program |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and turnaround costs |  | $ 900 | 500 | $ 2,900 |
Cumulative costs to date | $ 58,700 |  | $ 58,700 |  |

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