Property and Equipment, net (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Apr. 30, 2016
Property and equipment, net
Property and equipment, gross	$ 101,941	$ 92,759
Less accumulated depreciation and amortization	(82,721)	(75,997)
Property, Plant and Equipment, Net, Total	19,220	16,762
Leasehold improvements
Property and equipment, net
Property and equipment, gross	9,809	8,939
Machinery and equipment
Property and equipment, net
Property and equipment, gross	53,077	48,034
Furniture and fixtures
Property and equipment, net
Property and equipment, gross	1,962	1,730
Computer equipment and software
Property and equipment, net
Property and equipment, gross	32,485	30,171
Construction in process
Property and equipment, net
Property and equipment, gross	$ 4,608	$ 3,885

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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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))
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