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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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