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Nature of Business and Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	May 02, 2015	Apr. 26, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Sales returns, reserve	$ 93	$ 15
Deferred revenue period for recognition of product maintenance contracts	10 years
Percentage of net sales from services	9.70%	8.20%	8.40%

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- Definition

Revenue Recognition, Period of Deferred Revenue Recognition

+ References

No definition available.

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- Definition

The percentage of net service revenue to total net revenue from the sale of services as of year end.

+ References

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- Definition

Amount of estimated sales returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=68058157&loc=d3e18780-107790

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 15
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68051624&loc=d3e47468-111626

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