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Derivatives and Hedging-Disclosures and Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Company's Commodity Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The Company had no assets or liabilities that are measured at fair value on a nonrecurring basis subsequent to their initial recognition. The Company’s commodity financial assets and liabilities measured at fair value on a recurring basis are listed on the following table.
(In thousands) |  |  |  |  |  |  | Fair Value Measurements at Reporting Date Using: |
Derivatives Not Designated as Hedging Instruments |  |  |  |  |  |  | Quoted Prices in Active Markets for Identical Assets |  |  | Significant Other Observable Inputs |
Under FASB ASC 815-10 |  | Balance Sheet Location |  | Total |  |  | Level 1 |  |  | Level 2 |
Asset Derivatives at September 30, 2024 |
Commodity contracts |  | Fair liability value of derivative instruments |  | $ | 16,948 |  |  | $ | — |  |  | $ | 16,948 |
Commodity contracts |  | Long-term derivative assets included in the deferred charges and other assets, net and other long-term liabilities, net balances |  |  | 831 |  |  |  | — |  |  |  | 831 |
Commodity contract assets at September 30, 2024 |  | $ | 17,779 |  |  | $ | — |  |  | $ | 17,779 |
Liability Derivatives at September 30, 2024 |
Commodity contracts |  | Fair liability value of derivative instruments |  | $ | (30,919 | ) |  | $ | — |  |  | $ | (30,919 | )
Commodity contracts |  | Long-term derivative liabilities included in the deferred charges and other assets, net and other long-term liabilities, net balances |  |  | (965 | ) |  |  | — |  |  |  | (965 | )
Commodity contract liabilities at September 30, 2024 |  | $ | (31,884 | ) |  | $ | — |  |  | $ | (31,884 | )
Asset Derivatives at September 30, 2023 |
Commodity contracts |  | Fair asset and liability value of derivative instruments |  | $ | 17,891 |  |  | $ | — |  |  | $ | 17,891 |
Commodity contracts |  | Long-term derivative assets included in the deferred charges and other assets, net and other long-term liabilities, net balances |  |  | 779 |  |  |  | — |  |  |  | 779 |
Commodity contract assets at September 30, 2023 |  | $ | 18,670 |  |  | $ | — |  |  | $ | 18,670 |
Liability Derivatives at September 30, 2023 |
Commodity contracts |  | Fair asset and liability value of derivative instruments |  | $ | (7,349 | ) |  | $ | — |  |  | $ | (7,349 | )
Commodity contracts |  | Long-term derivative liabilities included in the deferred charges and other assets, net and other long-term liabilities, net balances |  |  | (679 | ) |  |  | — |  |  |  | (679 | )
Commodity contract liabilities at September 30, 2023 |  | $ | (8,028 | ) |  | $ | — |  |  | $ | (8,028 | )
Company's Commodity Derivatives Assets (Liabilities) Offset by Counterparty | The Company’s commodity derivative assets (liabilities) offset by counterparty and subject to an enforceable master netting arrangement are listed on the following table.
(In thousands) |  |  |  |  |  |  |  |  |  |  | Gross Amounts Not Offset in the Statement of Financial Position |
Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) |  | Gross Assets Recognized |  |  | Gross Liabilities Offset in the Statement of Financial Position |  |  | Net Assets (Liabilities) Presented in the Statement of Financial Position |  |  | Financial Instruments |  |  | Cash Collateral Received |  |  | Net Amount |
Long-term derivative assets included in deferred charges and other assets, net |  |  | 5 |  |  |  | (3 | ) |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | 2 |
Fair liability value of derivative instruments |  |  | 16,948 |  |  |  | (30,919 | ) |  |  | (13,971 | ) |  |  | — |  |  |  | — |  |  |  | (13,971 | )
Long-term derivative liabilities included in other long-term liabilities, net |  |  | 826 |  |  |  | (962 | ) |  |  | (136 | ) |  |  | — |  |  |  | — |  |  |  | (136 | )
Total at September 30, 2024 |  | $ | 17,779 |  |  | $ | (31,884 | ) |  | $ | (14,105 | ) |  | $ | — |  |  | $ | — |  |  | $ | (14,105 | )
Fair asset value of derivative instruments |  | $ | 17,815 |  |  | $ | (7,155 | ) |  | $ | 10,660 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,660 |
Long-term derivative assets included in deferred charges and other assets, net |  |  | 567 |  |  |  | (452 | ) |  |  | 115 |  |  |  | — |  |  |  | — |  |  |  | 115 |
Fair liability value of derivative instruments |  |  | 76 |  |  |  | (194 | ) |  |  | (118 | ) |  |  | — |  |  |  | — |  |  |  | (118 | )
Long-term derivative liabilities included in other long-term liabilities, net |  |  | 212 |  |  |  | (227 | ) |  |  | (15 | ) |  |  | — |  |  |  | — |  |  |  | (15 | )
Total at September 30, 2023 |  | $ | 18,670 |  |  | $ | (8,028 | ) |  | $ | 10,642 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,642 |
Company's Effect on Derivative Instruments on the Statement of Operations |
(In thousands) |  |  |  |  |  |  |  |  |  |  |
The Effect of Derivative Instruments on the Statement of Operations |
|  |  |  | Amount of (Gain) or Loss Recognized |
|  |  |  | Years Ended September 30, |
Derivatives Not Designated as Hedging Instruments Under FASB ASC 815-10 |  | Location of (Gain) or Loss Recognized in Income on Derivative |  | 2024 |  |  | 2023 |  |  | 2022 |
Commodity contracts |  | Cost of product (a) |  | $ | 20,268 |  |  | $ | 17,268 |  |  | $ | (34,523 | )
Commodity contracts |  | Cost of installations and service (a) |  | $ | (184 | ) |  | $ | 16 |  |  | $ | (1,555 | )
Commodity contracts |  | Delivery and branch expenses (a) |  | $ | (865 | ) |  | $ | 434 |  |  | $ | (3,423 | )
Commodity contracts |  | (Increase) / decrease in the fair value of derivative instruments (b) |  | $ | 19,018 |  |  | $ | 1,977 |  |  | $ | 17,286 |
(a) Represents realized closed positions and includes the cost of options as they expire. (b) Represents the change in value of unrealized open positions and expired options.

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