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Selected Financial Statement Data - Property and Equipment (Details) - USD ($) $ in Thousands	Apr. 28, 2018	Apr. 29, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 237,209	$ 223,941
Less accumulated depreciation	169,150	157,192
Property and equipment, net	68,059	66,749
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,161	2,099
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	67,773	65,935
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	93,439	84,189
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,878	5,604
Computer software and hardware
Property, Plant and Equipment [Line Items]
Property and equipment, gross	53,004	51,523
Equipment held for rental
Property, Plant and Equipment [Line Items]
Property and equipment, gross	287	374
Demonstration equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,035	7,109
Transportation equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 7,632	$ 7,108

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)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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-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

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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
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-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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+ References

Reference 1: 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

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-Topic 210
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
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