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Income Taxes (Deferred Tax Amounts) (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2012
Apr. 30, 2011
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