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RESTRUCTURING (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 18 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]            
Restructuring and turnaround costs $ 2,118 $ 5,787 $ 5,467 $ 8,270    
Restructuring liability 14,971   14,971   $ 14,971 $ 28,535
Restructuring liability payable in next twelve months 13,600   13,600   13,600  
Restructuring costs (33) 151 (325) 1,207    
Turnaround costs 2,151 5,636 5,792 7,063    
2018 Program            
Restructuring Cost and Reserve [Line Items]            
Restructuring and turnaround costs 1,900   5,300   41,900  
Restructuring liability 14,492   14,492   14,492 27,129
Restructuring costs     (382)      
2018 Program | Minimum            
Restructuring Cost and Reserve [Line Items]            
Expected cost           50,000
2018 Program | Minimum | Employee Severance            
Restructuring Cost and Reserve [Line Items]            
Expected cost           35,000
2018 Program | Maximum            
Restructuring Cost and Reserve [Line Items]            
Expected cost           60,000
2018 Program | Maximum | Employee Severance            
Restructuring Cost and Reserve [Line Items]            
Expected cost           40,000
2017 Program            
Restructuring Cost and Reserve [Line Items]            
Restructuring and turnaround costs   $ 5,200   $ 7,700    
Restructuring liability $ 479   479   $ 479 $ 1,406
Restructuring costs     $ 57