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Divestiture Transactions and Discontinued Operations - Schedule of Revenues and Loss Before Income Taxes Attributable to Discontinued Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Discontinued Operations and Disposal Groups [Abstract]
Revenues	$ 3,316	$ 12,033
Income (loss) before income taxes	$ 284	$ (4,480)

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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