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Investments - Available For Sale Securities (Details) - USD ($) $ in Thousands	Aug. 01, 2020	Apr. 30, 2020
Available-For-Sale Securities
Amortized Cost	$ 86,322	$ 58,032
Gross Unrealized Gains	17	70
Gross Unrealized Losses	(1)	(7)
Total	86,338	58,095
Municipal securities
Available-For-Sale Securities
Amortized Cost	1,345	6,807
Gross Unrealized Gains	3	29
Total	1,348	6,836
U.S. government securities
Available-For-Sale Securities
Amortized Cost	84,977	42,730
Gross Unrealized Gains	14	41
Gross Unrealized Losses	(1)	(4)
Total	$ 84,990	42,767
Corporate bonds
Available-For-Sale Securities
Amortized Cost		8,495
Gross Unrealized Losses		(3)
Total		$ 8,492

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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