INVESTMENTS AND FAIR VALUE MEASUREMENTS - AMORTIZED COST (Details) - USD ($) $ in Thousands	Jan. 31, 2026	Apr. 30, 2025
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	$ 56,975	$ 110,153
Unrealized Gains	6,287	7,370
Unrealized Losses	(15,168)	(14,854)
Fair Value	48,094	102,669
Marketable-Equity Securities \| Equity securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	56,975	63,677
Unrealized Gains	6,287	6,892
Unrealized Losses	(15,168)	(14,785)
Fair Value	$ 48,094	55,784
Marketable-Debt Securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost		46,476
Unrealized Gains		478
Unrealized Losses		(69)
Fair Value		46,885
Marketable-Debt Securities \| U.S. treasury securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost		32,674
Unrealized Gains		331
Unrealized Losses		0
Fair Value		33,005
Marketable-Debt Securities \| Corporate bonds
Debt and Equity Securities, FV-NI
Cost or Amortized Cost		13,802
Unrealized Gains		147
Unrealized Losses		(69)
Fair Value		$ 13,880