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DEBT - Narrative (Details)
9 Months Ended
Jan. 27, 2018
USD ($)
Jan. 28, 2017
USD ($)
Jan. 27, 2018
CAD
Line of Credit Facility [Line Items]      
Proceeds from borrowings $ 71,300,000 $ 0  
Repayments of lines of credit 3,000,000 $ 20,000,000  
Bank of America Credit Facility      
Line of Credit Facility [Line Items]      
Maximum principal amount 150,000,000    
Option to increase principal amount, additional amount (up to) $ 100,000,000    
Basis spread on variable rate 1.25%    
Variable rate basis LIBOR    
Proceeds from borrowings $ 70,000,000    
Repayments in the period 3,200,000    
Interest expense 1,200,000    
Amount outstanding 95,000,000    
BMO Harris Credit Facility      
Line of Credit Facility [Line Items]      
Maximum principal amount | CAD     CAD 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]      
Maximum principal amount 10,000,000    
Option to increase principal amount, additional amount (up to) 3,500,000    
Proceeds from borrowings 0    
Amount outstanding 3,800,000    
Repayments of lines of credit 200,000    
Line of credit, due in next 12 months $ 700,000    
Pacific Insight      
Line of Credit Facility [Line Items]      
Number of separate credit agreements 2    
Canadian Dollar Offered Rate [Member] | 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 [Member] | 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) [Member] | BMO Harris Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.75%    
Variable rate basis LIBOR    
London Interbank Offered Rate (LIBOR) [Member] | Roynat Credit Facility      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 2.25%    
Variable rate basis LIBOR