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Investments (Details) - USD ($) $ in Thousands	Aug. 01, 2020	Apr. 30, 2020
Short-term investments:
Total short-term investments	$ 71,334	$ 47,507
Long-term investments:
Equity Method Investments.	5,334	4,442
Total long-term investments	20,338	15,030
Investment in limited partnership fund
Long-term investments:
Equity Method Investments.	5,334	4,442
Available-for-sale securities
Short-term investments:
Total short-term investments	71,334	47,507
Long-term investments:
Total long-term investments	15,004	10,588
Available-for-sale securities | Municipal securities
Short-term investments:
Total short-term investments	1,348	5,244
Long-term investments:
Total long-term investments		1,592
Available-for-sale securities | U.S. government securities
Short-term investments:
Total short-term investments	69,986	33,771
Long-term investments:
Total long-term investments	$ 15,004	8,996
Available-for-sale securities | Corporate bonds
Short-term investments:
Total short-term investments		$ 8,492

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