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INVESTMENTS AND FAIR VALUE MEASUREMENTS - AMORTIZED COST (Details) - USD ($) $ in Thousands	Jul. 31, 2025	Apr. 30, 2025
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	$ 97,650	$ 110,153
Unrealized Gains	6,960	7,370
Unrealized Losses	(13,383)	(14,854)
Fair Value	91,227	102,669
Marketable-Equity Securities | Equity securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	67,956	63,677
Unrealized Gains	6,659	6,892
Unrealized Losses	(13,310)	(14,785)
Fair Value	61,305	55,784
Marketable-Debt Securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	29,694	46,476
Unrealized Gains	301	478
Unrealized Losses	(73)	(69)
Fair Value	29,922	46,885
Marketable-Debt Securities | U.S. treasury securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	15,907	32,674
Unrealized Gains	139	331
Unrealized Losses	0	0
Fair Value	16,046	33,005
Marketable-Debt Securities | Corporate bonds
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	13,787	13,802
Unrealized Gains	162	147
Unrealized Losses	(73)	(69)
Fair Value	$ 13,876	$ 13,880

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6B

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