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Line of Credit (Details) (Line of credit, USD $)
 12 Months Ended
Apr. 27, 2013
Sep. 21, 2012
Sep. 20, 2012
Line of credit
      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   $ 100,000,000 $ 75,000,000
Optional increase in borrowing capacity   50,000,000  
Basis spread on variable rate 1.50%    
Variable rate basis LIBOR    
Borrowings in the period 37,000,000    
Repayments in the period 42,481,000    
Interest expense 981,000    
Amount outstanding 43,500,000    
Available borrowing capacity $ 56,500,000