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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
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Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Schedule Of Income Taxes [Line Items] |  |  |  |
Undistributed earnings of foreign subsidiaries | $ 571,300,000 |  |  |
Unrecognized tax benefits liability | 9,954,000 | $ 6,037,000 | $ 7,794,000 | $ 3,674,000
Unrecognized tax benefits, reductions resulting from resolution | (1,300,000) |  |  |
Unrecognized tax benefits, interest on income taxes accrued | 900,000 | 600,000 | 400,000 |
Unrecognized tax benefits, income tax penalties accrued | 500,000 | 0 | 0 |
Recognized interest expense | 800,000 | $ 200,000 | $ 100,000 |
Internal Revenue Service (IRS) |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | $ 2,200,000 |  |  |
Net operating loss carryforward, will be fully utilized | 2028 |  |  |
State and Local Jurisdiction |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | $ 40,300,000 |  |  |
Net operating loss carryforward, beginning expiration | 2022 |  |  |
Foreign Tax Authority |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | $ 159,300,000 |  |  |
Net operating loss carryforward, beginning expiration | 2022 |  |  |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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