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Selected Financial Statement Data - Property and Equipment (Details) - USD ($) $ in Thousands	Apr. 29, 2017	Apr. 30, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 223,941	$ 229,034
Less accumulated depreciation	157,192	155,871
Property and equipment, net	66,749	73,163
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,099	2,155
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	65,935	65,247
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	84,189	82,973
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,604	14,746
Computer software and hardware
Property, Plant and Equipment [Line Items]
Property and equipment, gross	51,523	48,917
Equipment held for rental
Property, Plant and Equipment [Line Items]
Property and equipment, gross	374	374
Demonstration equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,109	8,026
Transportation equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 7,108	$ 6,596

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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X

- 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

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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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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