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Deferred Tax Amounts (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2014 | Apr. 30, 2013
--- | --- | ---
Income Taxes [Line Items] |  |
Current, Deferred tax assets | $ 15,591 | $ 13,791
Current, Deferred tax liabilities | (10,813) | (10,220)
Valuation allowance | (292) | (60)
Current, Deferred tax asset | 4,486 | 3,511
Non-current, Deferred tax asset | 109,965 | 116,280
Non-current, Deferred tax liabilities | (28,249) | (25,406)
Valuation allowance | (26,677) | (27,671)
Non-current deferred tax asset, net | 55,039 | 63,203
Net deferred tax asset | $ 59,525 | $ 66,714

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