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Line of Credit - Narrative (Details) - USD ($)
 12 Months Ended
May. 02, 2015
May. 03, 2014
Apr. 27, 2013
Line of Credit Facility [Line Items]      
Proceeds from borrowings $ 0 $ 38,000,000 $ 37,000,000
Repayments in the period 43,000,000 $ 33,500,000 $ 41,500,000
Line of credit      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity 100,000,000    
Optional increase in borrowing capacity, up to $ 50,000,000    
Basis spread on variable rate 1.50%    
Variable rate basis LIBOR    
Proceeds from borrowings $ 0    
Repayments in the period 43,700,000    
Interest expense 700,000    
Amount outstanding 5,000,000    
Available borrowing capacity $ 95,000,000