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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Apr. 30, 2021 | Apr. 30, 2020
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Income Tax Disclosure [Abstract] |  |
Deferred compensation | $ 107,834 | $ 86,479
Operating lease liability | 34,183 | 37,934
Loss carryforwards | 39,704 | 27,845
Reserves and accruals | 16,393 | 14,211
Allowance for doubtful accounts | 4,885 | 4,029
Other |  | 2,703
Gross deferred tax assets | 202,999 | 173,201
Operating lease, right-of-use, assets | (27,777) | (29,998)
Intangibles and Goodwill | (26,570) | (29,006)
Property and equipment | (20,590) | (22,332)
Prepaid expenses | (23,928) | (19,567)
Marketable Securities | (7,003) |
Other | (2,684) |
Gross deferred tax liabilities | (108,552) | (100,903)
Valuation allowances | (25,173) | (17,875)
Net deferred tax asset | $ 69,274 | $ 54,423

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