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Nature of Business and Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	May. 02, 2015	Apr. 26, 2014	Apr. 27, 2013
Property, Plant and Equipment [Line Items]
Depreciation	$ 14,764	$ 14,137	$ 15,379
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Office furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Office furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Computer software and hardware | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Computer software and hardware | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Equipment held for rental | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Equipment held for rental | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Demonstration equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Demonstration equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Transportation equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Transportation equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 28



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

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+ References

No definition available.

+ Details

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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