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Accumulated Other Comprehensive Income and Reclassifications Adjustments - Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2021 | Aug. 01, 2020 | Apr. 30, 2021 | Apr. 30, 2020
Accumulated other comprehensive loss |  |  |  |
Unrealized losses, tax portion | $ 0 | $ 4 |  |
Accumulated Other Comprehensive Income |  |  |  |
Accumulated other comprehensive loss |  |  |  |
Other comprehensive income, tax | $ 1 | $ 4 | $ 1 | $ 0

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