Property and Equipment, net (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Property and equipment, net
Property and equipment, gross	$ 78,811	$ 67,766
Less accumulated depreciation and amortization	(54,382)	(44,251)
Property and equipment, net	24,429	23,515
Leasehold improvements
Property and equipment, net
Property and equipment, gross	8,498	8,471
Machinery and equipment
Property and equipment, net
Property and equipment, gross	37,873	32,883
Furniture and fixtures
Property and equipment, net
Property and equipment, gross	1,866	2,415
Computer equipment and software
Property and equipment, net
Property and equipment, gross	23,432	14,894
Construction in process
Property and equipment, net
Property and equipment, gross	$ 7,142	$ 9,103

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived 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, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived 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, furniture and fixtures, and computer equipment.

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