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Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Apr. 30, 2018 | Apr. 30, 2017
--- | --- | ---
Income Taxes [Line Items] |  |
Deferred compensation | $ 67,852 | $ 92,043
Loss and credit carryforwards | 22,297 | 32,854
Reserves and accruals | 13,945 | 14,095
Deferred rent | 6,827 | 9,797
Deferred revenue | 1,793 | 2,434
Allowance for doubtful accounts | 2,296 | 1,705
Other | 982 | 3,041
Gross deferred tax assets | 115,992 | 155,969
Intangibles | (57,046) | (90,214)
Property and equipment | (5,000) | (11,507)
Prepaid expenses | (19,123) | (17,324)
Other | (2,726) | (2,485)
Gross deferred tax liabilities | (83,895) | (121,530)
Valuation allowances | (15,682) | (21,278)
Net deferred tax asset | $ 16,415 | $ 13,161

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