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Selected Financial Statement Data - Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Apr. 26, 2014	Apr. 27, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 208,995	$ 195,266
Less accumulated depreciation	143,725	133,641
Property and equipment, net	65,270	61,625
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,539	1,497
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	59,363	57,012
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	72,787	65,600
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,754	16,118
Computer software and hardware
Property, Plant and Equipment [Line Items]
Property and equipment, gross	45,329	41,745
Equipment held for rental
Property, Plant and Equipment [Line Items]
Property and equipment, gross	868	868
Demonstration equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,532	8,400
Transportation equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4,823	$ 4,026

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



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

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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

-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



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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

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

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



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-Name Accounting Standards Codification

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



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