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RESTRUCTURING (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Dec. 26, 2020
Dec. 28, 2019
Mar. 28, 2020
Restructuring Cost and Reserve [Line Items]          
Restructuring and turnaround costs $ 3,143 $ 7,798 $ 11,583 $ 13,582  
Restructuring liability 1,115   1,115   $ 2,648
Restructuring liability payable in next twelve months 700   700    
Turnaround costs 3,235 7,181 10,683 10,653  
2020 Program          
Restructuring Cost and Reserve [Line Items]          
Restructuring and turnaround costs 3,100 3,900 11,100 3,900  
Cumulative costs to date 22,900   22,900    
Restructuring liability 595   595   $ 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   $ 3,900 500 $ 6,800  
Cumulative costs to date $ 58,700   $ 58,700