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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