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Line of Credit (Details) (USD $)
 12 Months Ended
May 03, 2014
Apr. 27, 2013
Apr. 28, 2012
May 03, 2014
Line of credit
Sep. 21, 2012
Line of credit
Line of Credit Facility [Line Items]          
Maximum borrowing capacity         $ 100,000,000
Optional increase in borrowing capacity         50,000,000
Basis spread on variable rate       1.50%  
Variable rate basis       LIBOR  
Proceeds from borrowings 38,000,000 37,000,000 52,000,000 38,000,000  
Repayments in the period 33,500,000 41,500,000 4,000,000 34,600,000  
Interest expense       1,100,000  
Amount outstanding       48,000,000  
Available borrowing capacity       $ 52,000,000