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Investments (Details) - USD ($)	Apr. 30, 2026	Dec. 22, 2025	Apr. 30, 2025
Short-term investments:
Total short-term investments	$ 254,972,000
Long-term investments:
Total long-term investments	$ 81,128,000		$ 31,627,000
Investment, Type [Extensible Enumeration]	Available-for-sale securities		Available-for-sale securities
Investments at cost	$ 8,000,000	$ 3,000,000
U.S. government securities
Short-term investments:
Total short-term investments	137,759,000
Long-term investments:
Total long-term investments	14,106,000
Corporate securities
Short-term investments:
Total short-term investments	117,213,000
Long-term investments:
Total long-term investments	6,953,000
Equity securities and warrants
Long-term investments:
Total long-term investments			$ 1,204,000
Investment in limited partnership funds
Long-term investments:
Equity method investments	52,069,000		30,423,000
Available-for-sale securities
Long-term investments:
Total long-term investments	29,059,000		1,204,000
Equity method investments
Long-term investments:
Total long-term investments	$ 52,069,000		$ 30,423,000