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Divestiture Transactions and Discontinued Operations - Schedule of Revenues and Income Before Income Taxes Attributable to Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Discontinued Operations And Disposal Groups [Abstract]
Revenues		$ 3,312
Income before income taxes		$ 329

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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