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Selected Financial Statement Data - Property and Equipment (Details) - USD ($) $ in Thousands	May. 02, 2015	Apr. 26, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 228,017	$ 208,995
Less accumulated depreciation	155,173	143,725
Property and equipment, net	72,844	65,270
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,147	2,539
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	64,186	59,363
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	80,664	72,787
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,823	15,754
Computer software and hardware
Property, Plant and Equipment [Line Items]
Property and equipment, gross	51,083	45,329
Equipment held for rental
Property, Plant and Equipment [Line Items]
Property and equipment, gross	803	868
Demonstration equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,299	7,532
Transportation equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 6,012	$ 4,823

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 360



-SubTopic 10



-Section 50



-Paragraph 1



-Subparagraph (c)



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-Section 02



-Paragraph 14



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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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



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+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



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-Section S99



-Paragraph 1



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