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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Allowance for Doubtful Accounts |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at Beginning of Period |  | $ 17,845 | $ 15,455 | $ 11,292
Charges to Cost and Expenses |  | 14,260 | 13,675 | 12,987
Recoveries (Charges) to Other Accounts | [1] | (826) | 551 | (415)
Deductions | [2] | (9,697) | (11,836) | (8,409)
Balance at End of Period |  | 21,582 | 17,845 | 15,455
Valuation Allowance of Deferred Tax Assets |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at Beginning of Period |  | 15,682 | 21,278 | 22,030
Charges to Cost and Expenses |  | 5,170 | 3,421 | 7,931
Deductions | [2] | (6,820) | (9,017) | (8,683)
Balance at End of Period |  | $ 14,032 | $ 15,682 | $ 21,278
[1] | Exchange rate fluctuations.
[2] | Allowance for doubtful accounts represents accounts written-off, net of recoveries and deferred tax asset valuation represents release of prior valuation allowances.

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