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Cash Flow Information - Non-Cash Investing and Financing Activities (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 27, 2013
Apr. 28, 2012
Apr. 30, 2011
Supplemental Cash Flow Elements [Abstract]      
Demonstration equipment transferred to inventory $ 612 $ 409 $ 896
Purchases of property and equipment included in accounts payable 1,207 1,475 673
Contributions of common stock under the employee stock purchase plan $ 1,482 $ 1,413 $ 1,382