Fair Value Measurements (Details) - USD ($) $ in Thousands	Apr. 30, 2026	Apr. 30, 2025
Fair Value Measurements
Available-for-sale securities	$ 276,031
Recurring basis
Fair Value Measurements
Available-for-sale securities	276,031
Equity securities		$ 1,080
Warrants		124
Total	276,031	1,204
Financial liabilities measured at fair value	0	0
Recurring basis | Quoted prices in active market for identical assets (Level 1)
Fair Value Measurements
Equity securities		1,080
Total		1,080
Recurring basis | Significant other observable inputs (Level 2)
Fair Value Measurements
Available-for-sale securities	276,031
Warrants		124
Total	$ 276,031	$ 124