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Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Apr. 30, 2015 | Apr. 30, 2014
--- | --- | ---
Income Taxes [Line Items] |  |
Deferred compensation | $ 71,182 | $ 66,359
Loss and credit carryforwards | 26,211 | 35,177
Reserves and accruals | 9,344 | 8,706
Deferred rent | 6,432 | 5,575
Deferred revenue | 277 | 1,672
Allowance for doubtful accounts | 1,831 | 1,536
Other | 6,629 | 6,531
Gross deferred tax assets | 121,906 | 125,556
Intangibles | (20,828) | (21,507)
Property and equipment | (6,289) | (6,277)
Prepaid expenses | (7,687) | (5,600)
Other | (5,653) | (5,678)
Gross deferred tax liabilities | (40,457) | (39,062)
Valuation allowances | (21,608) | (26,969)
Net deferred tax asset | $ 59,841 | $ 59,525

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