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Derivatives and Hedging-Disclosures and Fair Value Measurements - Company's Commodity Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 - Commodity Contract - USD ($)
$ in Thousands
Jun. 30, 2023
Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts $ 17,798 $ 53,228
Derivative Liabilities, commodity contracts (28,310) (35,237)
Fair asset and liability value of derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 17,224 51,134
Derivative Liabilities, commodity contracts (27,622) (34,494)
Other long-term liabilities, net balance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 574  
Derivative Liabilities, commodity contracts (688)  
Deferred charges and other assets, net and other long-term liabilities, net balances    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts   2,094
Derivative Liabilities, commodity contracts   (743)
Significant Other Observable Inputs Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 17,798 53,228
Derivative Liabilities, commodity contracts (28,310) (35,237)
Significant Other Observable Inputs Level 2 | Fair asset and liability value of derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 17,224 51,134
Derivative Liabilities, commodity contracts (27,622) (34,494)
Significant Other Observable Inputs Level 2 | Other long-term liabilities, net balance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts 574  
Derivative Liabilities, commodity contracts $ (688)  
Significant Other Observable Inputs Level 2 | Deferred charges and other assets, net and other long-term liabilities, net balances    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, commodity contracts   2,094
Derivative Liabilities, commodity contracts   $ (743)