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Divestiture Transactions and Discontinued Operations - Schedule of Revenues and (Loss) Income Before Income Taxes Attributable to Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]
Revenues	$ 0	$ 5	$ 0	$ 3,316
(Loss) income before income taxes	$ 0	$ (45)	$ 0	$ 284

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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