Allowance for Credit Losses (Details) (USD $)	12 Months Ended
	Apr. 26, 2014	Apr. 27, 2013
Allowance for Credit Losses [Abstract]
Notes receivable, gross	$ 4,300,000	$ 8,300,000
Number of customers with notes receivable balance	6	9
Notes receivable, current	700,000	1,800,000
Notes receivable written off during the period	2,700,000
Allowance for Credit Losses [Member]
Analysis of allowance for credit losses [Roll Forward]
Beginning balance	1,986,000	1,537,000
Recoveries	0	(73,000)
Write-offs	(1,888,000)	0
Provision for credit losses	60,000	522,000
Ending balance	$ 158,000	$ 1,986,000