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Income Taxes (Deferred Tax Amounts) (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2012 | Apr. 30, 2011
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Income Taxes [Abstract] |  |
Current, Deferred tax assets | $ 15,357 | $ 10,214
Current, Deferred tax liabilities | (4,527) |
Current deferred tax asset, net | 10,830 | 10,214
Non-current, Deferred tax asset | 94,593 | 101,207
Non-current, Deferred tax liabilities | (12,214) | (10,621)
Non-current deferred tax asset | 82,379 | 90,586
Valuation allowance | (25,089) | (26,168)
Non-current deferred tax asset, net | 57,290 | 64,418
Net deferred tax asset | $ 68,120 | $ 74,632

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