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Investments - Available For Sale Securities (Details) - USD ($) $ in Thousands	Jan. 29, 2022	Apr. 30, 2021
Available-For-Sale Securities.
Amortized Cost	$ 3,972	$ 36,953
Gross Unrealized Gains		9
Gross Unrealized Losses	(3)	(3)
Total	3,969	36,959
Municipal securities
Available-For-Sale Securities.
Amortized Cost	3,972	23,227
Gross Unrealized Gains		8
Gross Unrealized Losses	(3)	(2)
Total	$ 3,969	23,233
U.S. government securities
Available-For-Sale Securities.
Amortized Cost		8,008
Gross Unrealized Gains		1
Total		8,009
Corporate bonds
Available-For-Sale Securities.
Amortized Cost		5,718
Gross Unrealized Losses		(1)
Total		$ 5,717

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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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