| Line Item | Aug 31, 2025 | Aug 31, 2024 | Aug 31, 2023 | Aug 31, 2022 | Aug 31, 2021 | Aug 31, 2020 | Aug 31, 2019 | Aug 31, 2018 |
|---|---|---|---|---|---|---|---|---|
| Expenses | ||||||||
| General and administrative | ||||||||
| Interest | — | |||||||
| Foreign exchange gain | ||||||||
| Share of joint venture expenditures - Lion Battery | ||||||||
| Stock based compensation expense | ||||||||
| Operating expenses, total | ||||||||
| Other Income | ||||||||
| Gain on fair value derivatives & other instruments | — | |||||||
| Write-off due to prospecting right closures | — | |||||||
| Loss on partial repayment of debt and convertible notes | — | |||||||
| Gain on Sprott extension | — | |||||||
| Other income | ||||||||
| Loss for the year before income taxes | ||||||||
| Deferred income tax expense | ||||||||
| Net Loss | ||||||||
| Net loss attributable to: | ||||||||
| Shareholders of Platinum Group Metals Ltd. | ||||||||
| Loss |