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Segments - Additional Information (Detail) - Segment | 12 Months Ended
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Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Segment Reporting Information [Line Items] |  |  |
Number of global business segments | 4 |  |
Geographic Concentration Risk | Sales Revenue, Net [Member] | UNITED STATES | Minimum |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk percentage | 10.00% | 10.00% | 10.00%
Geographic Concentration Risk | Sales Revenue, Net [Member] | United Kingdom | Minimum |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk percentage | 10.00% | 10.00% | 10.00%
Geographic Concentration Risk | Long-Lived Assets | UNITED STATES | Minimum |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk percentage | 10.00% | 10.00% | 10.00%
Geographic Concentration Risk | Long-Lived Assets | United Kingdom | Minimum |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk percentage | 10.00% | 10.00% | 10.00%

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