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Investments (Details) - USD ($) $ in Thousands	Jan. 28, 2023	Apr. 30, 2022
Short-term investments:
Total short-term investments		$ 24,716
Long-term investments:
Equity Method Investments.	$ 16,017	15,433
Total long-term investments	19,319	15,433
Investment in limited partnership fund
Long-term investments:
Equity Method Investments.	16,017	15,433
Available-for-sale securities.
Short-term investments:
Total short-term investments		24,716
Long-term investments:
Total long-term investments	3,302
Available-for-sale securities. | Municipal securities
Short-term investments:
Total short-term investments		19,725
Available-for-sale securities. | U.S. government securities
Short-term investments:
Total short-term investments		$ 4,991
Available-for-sale securities. | Equity securities and warrants
Long-term investments:
Total long-term investments	$ 3,302

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