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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, 2025 | Sep. 30, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Assets, commodity contracts | $ 7,728 | $ 17,779
Derivative Liabilities, commodity contracts | (9,255) | (31,884)
Fair liability and fair asset value of derivative instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Assets, commodity contracts | 7,165 | 16,948
Derivative Liabilities, commodity contracts | (8,769) | (30,919)
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 |  | 831
Derivative Liabilities, commodity contracts |  | (965)
Deferred Charges And Other Assets Net |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Assets, commodity contracts | 563 |
Derivative Liabilities, commodity contracts | (486) |
Significant Other Observable Inputs Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Assets, commodity contracts | 7,728 | 17,779
Derivative Liabilities, commodity contracts | (9,255) | (31,884)
Significant Other Observable Inputs Level 2 | Fair liability and fair asset value of derivative instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Assets, commodity contracts | 7,165 | 16,948
Derivative Liabilities, commodity contracts | (8,769) | (30,919)
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 |  | 831
Derivative Liabilities, commodity contracts |  | $ (965)
Significant Other Observable Inputs Level 2 | Deferred Charges And Other Assets Net |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Assets, commodity contracts | 563 |
Derivative Liabilities, commodity contracts | $ (486) |

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