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Segments - Long Lived Assets, Excluding Financial Instruments and Tax Assets, Classified by Controlling Countries over Ten Percent (Detail) - USD ($) $ in Thousands | Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2022
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Segment Reporting Information [Line Items] |  |  |
Total long-lived assets | $ 322,313 | $ 304,566 | $ 305,906
U.S. |  |  |
Segment Reporting Information [Line Items] |  |  |
Total long-lived assets | 175,691 | 186,220 | 185,228
United Kingdom |  |  |
Segment Reporting Information [Line Items] |  |  |
Total long-lived assets | 64,280 | 22,893 | 26,711
Other countries |  |  |
Segment Reporting Information [Line Items] |  |  |
Total long-lived assets | $ 82,342 | $ 95,453 | $ 93,967

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |