v3.26.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Base overriding royalties (Details)
3 Months Ended
Apr. 30, 2026
MT
Disaggregation of Revenue  
Base overriding royalties, first tier portion percentage 90.00%
Base overriding royalties, first tier shipment ceiling (in million tons) 4
Base overriding royalties, second tier portion percentage 85.00%
Base overriding royalties, second tier shipment ceiling (in million tons) 2
Base overriding royalties, third tier portion percentage 25.00%
Base overriding royalties, third tier shipment threshold (in million tons) 6
First million tons shipped or deemed Shipped  
Disaggregation of Revenue  
Royalty earned on tons shipped or deemed shipped, percentage 2.50%
Second million tons shipped or deemed Shipped  
Disaggregation of Revenue  
Royalty earned on tons shipped or deemed shipped, percentage 3.50%
Third million tons shipped or deemed Shipped  
Disaggregation of Revenue  
Royalty earned on tons shipped or deemed shipped, percentage 5.00%
Fourth million tons shipped or deemed Shipped  
Disaggregation of Revenue  
Royalty earned on tons shipped or deemed shipped, percentage 5.50%
Beyond four million tons shipped or deemed Shipped  
Disaggregation of Revenue  
Royalty earned on tons shipped or deemed shipped, percentage 6.00%