Income Taxes - Additional Information (Details) - Federal Income Tax - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Apr. 30, 2025 |
Apr. 30, 2024 |
|
| Operating Loss Carryforwards [Line Items] | ||
| Cumulative net operating loss | $ 56 | $ 52 |
| Net operating loss carry-forward expiration year | 2028 |