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Inventories - Additional Information (Detail) - USD ($) $ in Thousands | Jul. 31, 2021 | Apr. 30, 2021
--- | --- | ---
Inventory [Line Items] |  |
Inventories | $ 17,852 | $ 16,517
International Subsidiaries |  |
Inventory [Line Items] |  |
Inventories | $ 2,395 | $ 2,560

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