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RESTRUCTURING (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 30, 2017
Dec. 31, 2016
Nov. 01, 2017
Apr. 01, 2017
Restructuring Cost and Reserve [Line Items]            
Restructuring and turnaround costs $ 31,298,000 $ 6,738,000 $ 39,568,000 $ 27,151,000    
Restructuring liability 31,429,000   31,429,000     $ 7,468,000
Restructuring liability payable in next twelve months 24,600,000   24,600,000      
Restructuring costs 28,455,000 2,032,000 29,662,000 18,064,000    
Turnaround costs 2,843,000 4,706,000 9,906,000 9,087,000    
Selling, General and Administrative Expenses            
Restructuring Cost and Reserve [Line Items]            
Restructuring costs 24,200,000   25,100,000      
Research and Development Expense            
Restructuring Cost and Reserve [Line Items]            
Restructuring costs 4,300,000   4,600,000      
2018 Program            
Restructuring Cost and Reserve [Line Items]            
Restructuring and turnaround costs 31,700,000   31,700,000      
Restructuring liability 28,311,000   28,311,000     0
Restructuring costs     28,607,000      
2018 Program | Minimum            
Restructuring Cost and Reserve [Line Items]            
Expected cost         $ 50,000,000  
2018 Program | Minimum | Employee Severance            
Restructuring Cost and Reserve [Line Items]            
Expected cost         35,000,000  
2018 Program | Maximum            
Restructuring Cost and Reserve [Line Items]            
Expected cost         60,000,000  
2018 Program | Maximum | Employee Severance            
Restructuring Cost and Reserve [Line Items]            
Expected cost         $ 40,000,000  
2017 Program            
Restructuring Cost and Reserve [Line Items]            
Restructuring and turnaround costs 0 $ 4,100,000 7,700,000 $ 22,900,000    
Restructuring liability $ 3,118,000   3,118,000     $ 7,468,000
Restructuring costs     $ 1,055,000