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DEBT - Narrative (Details)
 6 Months Ended
Oct. 27, 2018
USD ($)
Oct. 28, 2017
USD ($)
Oct. 27, 2018
CAD ($)
Line of Credit Facility [Line Items]      
Proceeds from borrowings $ 348,000,000 $ 61,100,000  
Repayments of lines of credit 46,600,000 $ 2,800,000  
Bank of America Credit Facility      
Line of Credit Facility [Line Items]      
Maximum principal amount 200,000,000    
Term loan, maximum borrowing capacity $ 250,000,000    
Term loan, term 5 years    
Option to increase principal amount, additional amount (up to) $ 200,000,000    
Basis spread on variable rate 1.50%    
Variable rate basis LIBOR    
Proceeds from borrowings $ 348,000,000    
Repayments in the period 41,500,000    
Interest expense 1,500,000    
Amount outstanding 88,000,000    
BMO Harris Credit Facility      
Line of Credit Facility [Line Items]      
Maximum principal amount     $ 10,000,000
Option to increase principal amount, additional amount (up to) 5,000,000    
Amount outstanding 0    
Roynat Credit Facility      
Line of Credit Facility [Line Items]      
Extinguishment of debt, amount 2,800,000    
Gain (loss) on extinguishment of debt (100,000)    
Repayments of lines of credit $ 3,800,000    
Canadian Dollar Offered Rate | BMO Harris Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.25%    
Variable rate basis Canadian Dollar Offered Rate    
Federal Funds Rate | BMO Harris Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.25%    
Variable rate basis Federal Funds Rate    
London Interbank Offered Rate (LIBOR) | BMO Harris Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.75%    
Variable rate basis LIBOR    
Term loan | Bank of America Credit Facility      
Line of Credit Facility [Line Items]      
Proceeds from borrowings $ 250,000,000    
Amount outstanding $ 250,000,000