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Capitalized Computer Software Development Costs (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Capitalized Software [Line Items]
Capitalized computer software development costs	$ 16,372	$ 12,954
Accumulated amortization	(7,664)	(5,163)
Capitalized software, net	$ 8,708	$ 7,791

For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.