| Schedule of Segment Reporting Information, by Segment [Table Text Block] |
| Three Months Ended April 30, 2025 | | Sales and service revenue | | | Depreciation, amortization and accretion | | | Loss from equity-accounted investment | | | Interest income | | | Loss before income taxes | | | Total expenditures for additions to long-lived assets | |
| Mining | | | | | | | | | | | | | | | | | | | | | | | | |
| Wyoming | | $ | - | | | $ | 1,098 | | | $ | - | | | $ | - | | | $ | (12,644 | ) | | $ | 190 | |
| Texas | | | - | | | | 264 | | | | - | | | | - | | | | (4,314 | ) | | | 1,962 | |
| Saskatchewan | | | - | | | | 38 | | | | - | | | | - | | | | (4,460 | ) | | | - | |
| Others | | | - | | | | 2 | | | | - | | | | - | | | | (104 | ) | | | - | |
| Corporate and administrative | | | - | | | | 3 | | | | (2,255 | ) | | | 571 | | | | (8,256 | ) | | | - | |
| Consolidated | | $ | - | | | $ | 1,405 | | | $ | (2,255 | ) | | $ | 571 | | | $ | (29,778 | ) | | $ | 2,152 | |
| Three Months Ended April 30, 2024 | | Sales and service revenue | | | Depreciation, amortization and accretion | | | Income from equity-accounted investment | | | Interest income | | | Loss before income taxes | | | Total expenditures for additions to long-lived assets | |
| Mining | | | | | | | | | | | | | | | | | | | | | | | | |
| Wyoming | | $ | - | | | $ | 400 | | | $ | - | | | $ | - | | | $ | (4,311 | ) | | $ | - | |
| Texas | | | - | | | | 120 | | | | - | | | | - | | | | (3,137 | ) | | | 158 | |
| Saskatchewan | | | - | | | | 26 | | | | - | | | | - | | | | (3,615 | ) | | | 102 | |
| Others | | | - | | | | 1 | | | | - | | | | - | | | | (185 | ) | | | - | |
| Corporate and administrative | | | - | | | | 4 | | | | 3,306 | | | | 993 | | | | (10,260 | ) | | | - | |
| Consolidated | | $ | - | | | $ | 551 | | | $ | 3,306 | | | $ | 993 | | | $ | (21,508 | ) | | $ | 260 | |
| Nine Months Ended April 30, 2025 | | Sales and service revenue | | | Depreciation, amortization and accretion | | | Loss from equity-accounted investment | | | Interest income | | | Loss before income taxes | | | Total expenditures for additions to long-lived assets | |
| Mining | | | | | | | | | | | | | | | | | | | | | | | | |
| Wyoming | | $ | - | | | $ | 2,386 | | | $ | - | | | $ | - | | | $ | (30,282 | ) | | $ | 191,523 | |
| Texas | | | - | | | | 536 | | | | - | | | | - | | | | (13,205 | ) | | | 3,140 | |
| Saskatchewan | | | - | | | | 113 | | | | - | | | | - | | | | (10,408 | ) | | | 273 | |
| Others | | | - | | | | 6 | | | | - | | | | - | | | | (954 | ) | | | 52 | |
| Corporate and administrative | | | 66,837 | | | | 7 | | | | (3,722 | ) | | | 2,897 | | | | (8,087 | ) | | | - | |
| Consolidated | | $ | 66,837 | | | $ | 3,048 | | | $ | (3,722 | ) | | $ | 2,897 | | | $ | (62,936 | ) | | $ | 194,988 | |
| Nine Months Ended April 30, 2024 | | Sales and service revenue | | | Depreciation, amortization and accretion | | | Income from equity-accounted investment | | | Interest income | | | Income (loss) before income taxes | | | Total expenditures for additions to long-lived assets | |
| Mining | | | | | | | | | | | | | | | | | | | | | | | | |
| Wyoming | | $ | 224 | | | $ | 1,177 | | | $ | - | | | $ | - | | | $ | (9,706 | ) | | $ | 242 | |
| Texas | | | - | | | | 376 | | | | - | | | | - | | | | (8,314 | ) | | | 186 | |
| Saskatchewan | | | - | | | | 55 | | | | - | | | | - | | | | (9,301 | ) | | | 2,088 | |
| Others | | | - | | | | 3 | | | | - | | | | - | | | | (671 | ) | | | 69 | |
| Corporate and administrative | | | - | | | | 9 | | | | 4,958 | | | | 1,559 | | | | 10,253 | | | | 3 | |
| Consolidated | | $ | 224 | | | $ | 1,620 | | | $ | 4,958 | | | $ | 1,559 | | | $ | (17,739 | ) | | $ | 2,588 | |
| As of April 30, 2025 | | Total assets | | | Equity-Accounted Investments | | | Long-lived assets other than financial instruments | |
| Mining | | | | | | | | | | | | |
| Wyoming | | $ | 365,453 | | | $ | - | | | $ | 352,824 | |
| Texas | | | 33,739 | | | | - | | | | 30,533 | |
| Saskatchewan | | | 379,045 | | | | - | | | | 377,653 | |
| Others | | | 20,800 | | | | - | | | | 20,445 | |
| Corporate and administrative | | | 208,773 | | | | 55,566 | | | | 156 | |
| Consolidated | | $ | 1,007,810 | | | $ | 55,566 | | | $ | 781,611 | |
| As of July 31, 2024 | | Total assets | | | Equity-Accounted Investments | | | Long-lived assets other than financial instruments | |
| Mining | | | | | | | | | | | | |
| Wyoming | | $ | 169,740 | | | $ | - | | | $ | 162,816 | |
| Texas | | | 23,776 | | | | - | | | | 21,028 | |
| Saskatchewan | | | 378,368 | | | | - | | | | 377,550 | |
| Others | | | 20,789 | | | | - | | | | 20,397 | |
| Corporate and administrative | | | 297,155 | | | | 58,809 | | | | 200 | |
| Consolidated | | $ | 889,828 | | | $ | 58,809 | | | $ | 581,991 | |
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