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Allowance for Credit Losses (Details) (USD $)
 3 Months Ended 6 Months Ended
Oct. 26, 2013
Oct. 27, 2012
Oct. 26, 2013
Oct. 27, 2012
Allowance for Credit Losses [Abstract]        
Notes receivable, gross $ 5,000,000   $ 5,000,000  
Notes receivable written off during the period 2,300,000      
Number of customers with notes receivable balance 6   6  
Notes receivable, current 800,000   800,000  
Allowance for Credit Losses [Member]
        
Analysis of allowance for credit losses [Roll Forward]        
Beginning balance 1,726,000 1,519,000 1,986,000 1,537,000
Recoveries 0 (38,000) 0 (56,000)
Write-offs (1,568,000) 0 (1,888,000) 0
Provision for credit losses 0 0 60,000 0
Ending balance $ 158,000 $ 1,481,000 $ 158,000 $ 1,481,000