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Investments (Details) - USD ($) $ in Thousands	Oct. 30, 2021	Apr. 30, 2021
Short-term investments:
Total short-term investments	$ 6,311	$ 31,971
Long-term investments:
Equity Method Investments.	11,271	7,168
Total long-term investments	11,271	12,156
Investment in limited partnership fund
Long-term investments:
Equity Method Investments.	11,271	7,168
Available-for-sale securities
Short-term investments:
Total short-term investments	6,311	31,971
Long-term investments:
Total long-term investments		4,988
Available-for-sale securities | Municipal securities
Short-term investments:
Total short-term investments	$ 6,311	22,245
Long-term investments:
Total long-term investments		988
Available-for-sale securities | U.S. government securities
Short-term investments:
Total short-term investments		4,009
Long-term investments:
Total long-term investments		4,000
Available-for-sale securities | Corporate bonds
Short-term investments:
Total short-term investments		$ 5,717

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