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DEBT AND CREDIT AGREEMENT - Narrative (Details) - USD ($)
 6 Months Ended
Oct. 31, 2015
Nov. 01, 2014
Line of Credit Facility [Line Items]    
Proceeds from borrowings $ 25,000,000 $ 0
Repayments in the period 8,000,000 $ 18,000,000
Line of credit    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity 100,000,000.0  
Optional increase in borrowing capacity, up to $ 50,000,000.0  
Basis spread on variable rate 1.50%  
Variable rate basis LIBOR  
Proceeds from borrowings $ 25,000,000  
Repayments in the period 8,200,000  
Interest expense 200,000  
Amount outstanding 22,000,000  
Available borrowing capacity $ 78,000,000