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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