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DEBT - Narrative (Details)
 9 Months Ended
Jan. 26, 2019
USD ($)
Jan. 27, 2018
USD ($)
Jan. 26, 2019
CAD ($)
Line of Credit Facility [Line Items]      
Proceeds from borrowings $ 350,000,000 $ 71,300,000  
Repayments of lines of credit (103,300,000) $ (3,000,000)  
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    
Quarterly payments $ 3,100,000    
Term loan, term 5 years    
Option to increase principal amount, additional amount (up to) $ 200,000,000    
Variable rate basis LIBOR    
Basis spread on variable rate 1.50%    
Proceeds from borrowings $ 350,000,000    
Repayments in the period (101,400,000)    
Interest expense (5,300,000)    
Amount outstanding 37,000,000    
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]      
Variable rate basis Canadian Dollar Offered Rate    
Basis spread on variable rate 1.25%    
Federal Funds Rate | BMO Harris Credit Facility      
Line of Credit Facility [Line Items]      
Variable rate basis Federal Funds Rate    
Basis spread on variable rate 1.25%    
London Interbank Offered Rate (LIBOR) | BMO Harris Credit Facility      
Line of Credit Facility [Line Items]      
Variable rate basis LIBOR    
Basis spread on variable rate 1.75%    
Term loan | Bank of America Credit Facility      
Line of Credit Facility [Line Items]      
Proceeds from borrowings $ 250,000,000    
Amount outstanding $ 246,900,000