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Fair Value of Financial Instruments - Derivative Contract Positions (Details)
bbl in Thousands, $ in Thousands
Sep. 30, 2025
USD ($)
bbl
Mar. 31, 2025
USD ($)
bbl
Derivative contract information    
Fair Value of Net Assets (Liabilities) $ (3,784) $ (9,688)
Net cash collateral provided 143 3,104
Net derivative liability (3,641) (6,584)
Prepaid expenses and other current assets    
Derivative contract information    
Net derivative liability 0 1,549
Other noncurrent assets    
Derivative contract information    
Net derivative liability 374 0
Fixed-price contract | Crude oil    
Derivative contract information    
Fair Value of Net Assets (Liabilities) (524) (6,492)
Fixed-price contract | Propane    
Derivative contract information    
Fair Value of Net Assets (Liabilities) (74)  
Fixed-price contract | Butane    
Derivative contract information    
Fair Value of Net Assets (Liabilities) $ 170 $ (482)
Fixed-price contract | Long | Crude oil    
Derivative contract information    
Net Long (Short) Notional Units (in barrels) | bbl   59
Fixed-price contract | Long | Propane    
Derivative contract information    
Net Long (Short) Notional Units (in barrels) | bbl 373  
Fixed-price contract | Short | Crude oil    
Derivative contract information    
Net Long (Short) Notional Units (in barrels) | bbl (531)  
Fixed-price contract | Short | Butane    
Derivative contract information    
Net Long (Short) Notional Units (in barrels) | bbl (747) (1,148)
Interest rate swaps    
Derivative contract information    
Fair Value of Net Assets (Liabilities) $ (3,320) $ (2,539)
Other    
Derivative contract information    
Fair Value of Net Assets (Liabilities) $ (36) $ (175)