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Investments in Unconsolidated Entities - Summarized Income Statement Financial Information of Investments in Unconsolidated Affiliates (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Investment Holdings [Abstract]
Revenue	$ 20,840	$ 19,494	$ 35,570	$ 32,595
Gross profit	4,956	4,300	7,641	5,900
Net income (loss)	$ 152	$ (297)	$ (1,843)	$ (3,866)

The amount of gross profit (loss) reported by an equity method investment of the entity.

The amount of net income (loss) reported by an equity method investment of the entity.