| Line Item | Jun 30, 2026 | Mar 31, 2026 | Dec 31, 2025 | Sep 30, 2025 | Jun 30, 2025 | Mar 31, 2025 | Sep 30, 2024 |
|---|---|---|---|---|---|---|---|
| General and administrative expenses | |||||||
| Loss from operations | |||||||
| Other income: | |||||||
| Interest earned on cash in bank account | — | — | |||||
| PIPE subscription expense | — | — | — | ||||
| Change in fair value of PIPE subscription derivative liability | — | — | — | ||||
| Total other income (expense) income | |||||||
| Net (loss) income | |||||||
| Basic and diluted net (loss) income per share, redeemable ordinary shares (in dollars per share) | — | — | — | — | |||
| Diluted net (loss) income per share, non-redeemable ordinary shares (in dollars per share) | — | — | — | — |