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Selected Financial Statement Data - Property and Equipment (Details) - USD ($) $ in Thousands	Apr. 30, 2016	May 02, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 229,034	$ 228,017
Less accumulated depreciation	155,871	155,173
Property and equipment, net	73,163	72,844
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,155	2,147
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	65,247	64,186
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	82,973	80,664
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	14,746	15,823
Computer software and hardware
Property, Plant and Equipment [Line Items]
Property and equipment, gross	48,917	51,083
Equipment held for rental
Property, Plant and Equipment [Line Items]
Property and equipment, gross	374	803
Demonstration equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,026	7,299
Transportation equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 6,596	$ 6,012

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
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-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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+ 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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-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
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