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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Allowance for Doubtful Accounts |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at Beginning of Period |  | $ 21,582 | $ 17,845 | $ 15,455
Charges to Cost and Expenses |  | 14,644 | 14,260 | 13,675
Recoveries (Charges) to Other Accounts | [1] | (311) | (826) | 551
Deductions | [2] | (12,120) | (9,697) | (11,836)
Balance at End of Period |  | 23,795 | 21,582 | 17,845
Valuation Allowance of Deferred Tax Assets |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at Beginning of Period |  | 14,032 | 15,682 | 21,278
Charges to Cost and Expenses |  | 886 | 5,170 | 3,421
Recoveries (Charges) to Other Accounts | [1] | 3,939 |  |
Deductions | [2] | (982) | (6,820) | (9,017)
Balance at End of Period |  | $ 17,875 | $ 14,032 | $ 15,682
[1] | Exchange rate fluctuations and for Deferred tax asset includes amount acquired from Acquired Companies.
[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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