Total Expenditures and Amortization of Capitalized Computer Software (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Capitalized Software [Line Items]
Total capitalized computer software development costs	$ 2,949	$ 3,418	$ 2,731
Total research and development expense	9,074	8,882	8,226
Total research and development expense and capitalized computer software-development costs	12,023	12,300	10,957
Total amortization of capitalized computer software development costs	$ 925	$ 2,501	$ 2,502

- Definition

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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