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Divestiture and Discontinued Operations - Schedule of Revenues and Loss Before Income Taxes Attributable to Discontinued Operations (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
Discontinued Operations And Disposal Groups [Abstract]
Revenues	$ 5	$ 3,498	$ 3,316	$ 7,055
(Loss) income before income taxes	$ (45)	$ (235)	$ 284	$ (451)

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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