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Nature of Business and Summary of Significant Accounting Policies - Revenue Recognition (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 27, 2013	Apr. 28, 2012	Apr. 30, 2011
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Sales returns, reserve	$ 73	$ 63
Deferred revenue period for recognition of product maintenance contracts	10 years
Percentage of net sales from services	9.00%	9.00%	9.40%
Cost of advertising net of amortization	$ 53	$ 446

X

- 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

Total expense recognized from advertising barter transactions for each income statement presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 99-17

-Paragraph 8

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Name Accounting Standards Codification

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- Definition

For each income statement presented, the 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=6367646&loc=d3e18780-107790



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 48

-Paragraph 6, 7, 8

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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