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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

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- 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) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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