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Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2025
Sep. 15, 2025
May 31, 2025
May 31, 2024
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
May 31, 2025
Business Combination [Line Items]                
Cash paid           $ 27,434 $ 652,672  
Williston Basin                
Business Combination [Line Items]                
Total consideration transferred   $ 550,000            
Security deposit   $ 55,000            
Williston Basin | Subsequent Event                
Business Combination [Line Items]                
Total consideration transferred $ 542,200              
Enerplus Corporation Acquisition                
Business Combination [Line Items]                
Total consideration transferred     $ 4,611,263          
Shares issued (in shares)       20,680,097        
Cash paid     $ 375,813 $ 375,800        
Estimated fair value       4,071,947        
Goodwill which is deductible for income tax purposes       $ 0        
Increase in inventory acquired               $ 9,200
Increase in accrued liabilities               8,700
Decrease to goodwill               $ 500
Merger-related costs         $ 17,500   $ 80,300