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Allowance for Credit Losses (Details) (USD $)
3 Months Ended
Jul. 27, 2013
Jul. 28, 2012
Allowance for Credit Losses [Abstract]    
Notes receivable, gross $ 7,600,000  
Number of customers with notes receivable balance 8  
Notes receivable, current 1,000,000  
Allowance for Credit Losses [Member]
   
Allowance for Credit Losses [Roll Forward]    
Beginning balance 1,986,000 1,537,000
Recoveries 0 (18,000)
Write-offs (320,000) 0
Provision for credit losses 60,000 0
Ending balance $ 1,726,000 $ 1,519,000