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Deferred Tax Amounts (Detail) - USD ($) $ in Thousands | Apr. 30, 2015 | Apr. 30, 2014
--- | --- | ---
Income Taxes [Line Items] |  |
Current, Deferred tax assets | $ 14,600 | $ 15,591
Current, Deferred tax liabilities | (10,488) | (10,813)
Valuation allowance | (285) | (292)
Current, Deferred tax asset | 3,827 | 4,486
Non-current, Deferred tax asset | 107,306 | 109,965
Non-current, Deferred tax liabilities | (29,969) | (28,249)
Valuation allowance | (21,323) | (26,677)
Non-current deferred tax asset, net | 56,014 | 55,039
Net deferred tax asset | $ 59,841 | $ 59,525

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