- 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.

+ References+ Details

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2013 Customer	Oct. 31, 2012 Customer	Oct. 31, 2013 Customer	Oct. 31, 2012 Customer	Apr. 30, 2013 Customer
Significant Accounting Policies [Line Items]
Number of clients that accounted for more than 10% of account receivables	0		0		0
Number of clients that accounted for more than 10% of revenue	0	0	0	0
General and administrative	$ 3,959	$ 7,153	$ 12,888	$ 22,830
Research and development	10,024	8,237	19,140	15,936
Bad Debts
Significant Accounting Policies [Line Items]
General and administrative		600		800
Information Technology
Significant Accounting Policies [Line Items]
Research and development		$ 1,000		$ 1,600