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Derivatives and Hedging-Disclosures and Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Company's Commodity Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | 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 March 31, 2024 |
Commodity contracts |  | Fair asset and liability value of derivative instruments |  | $ | 7,671 |  |  | $ | — |  |  | $ | 7,671 |
Commodity contracts |  | Long-term derivative assets included in the deferred charges and other assets, net and other long-term liabilities, net balances |  |  | 490 |  |  |  | — |  |  |  | 490 |
Commodity contract assets at March 31, 2024 |  | $ | 8,161 |  |  | $ | — |  |  | $ | 8,161 |
Liability Derivatives at March 31, 2024 |
Commodity contracts |  | Fair asset and liability value of derivative instruments |  | $ | (9,638 | ) |  | $ | — |  |  | $ | (9,638 | )
Commodity contracts |  | Long-term derivative liabilities included in the deferred charges and other assets, net and other long-term liabilities, net balances |  |  | (491 | ) |  |  | — |  |  |  | (491 | )
Commodity contract liabilities at March 31, 2024 |  | $ | (10,129 | ) |  | $ | — |  |  | $ | (10,129 | )
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 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 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 |
Fair asset value of derivative instruments |  | $ | 1,951 |  |  | $ | (1,729 | ) |  | $ | 222 |  |  | $ | — |  |  | $ | — |  |  | $ | 222 |
Long-term derivative assets included in deferred charges and other assets, net |  |  | 124 |  |  |  | (84 | ) |  |  | 40 |  |  |  | — |  |  |  | — |  |  |  | 40 |
Fair liability value of derivative instruments |  |  | 5,720 |  |  |  | (7,909 | ) |  |  | (2,189 | ) |  |  | — |  |  |  | — |  |  |  | (2,189 | )
Long-term derivative liabilities included in other long-term liabilities, net |  |  | 366 |  |  |  | (407 | ) |  |  | (41 | ) |  |  | — |  |  |  | — |  |  |  | (41 | )
Total at March 31, 2024 |  | $ | 8,161 |  |  | $ | (10,129 | ) |  | $ | (1,968 | ) |  | $ | — |  |  | $ | — |  |  | $ | (1,968 | )
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 |  |  | Amount of (Gain) or Loss Recognized |
Derivatives Not Designated as Hedging Instruments Under FASB ASC 815-10 |  | Location of (Gain) or Loss Recognized in Income on Derivative |  | Three Months Ended March 31, 2024 |  |  | Three Months Ended March 31, 2023 |  |  | Six Months Ended March 31, 2024 |  |  | Six Months Ended March 31, 2023 |
Commodity contracts |  | Cost of product (a) |  | $ | 13,386 |  |  | $ | 13,954 |  |  | $ | 18,109 |  |  | $ | 5,012 |
Commodity contracts |  | Cost of installations and service (a) |  | $ | (55 | ) |  | $ | 39 |  |  | $ | (41 | ) |  | $ | 79 |
Commodity contracts |  | Delivery and branch expenses (a) |  | $ | (517 | ) |  | $ | 349 |  |  | $ | (909 | ) |  | $ | 149 |
Commodity contracts |  | (Increase) / decrease in the fair value of derivative instruments (b) |  | $ | (11,752 | ) |  | $ | 3,022 |  |  | $ | 7,278 |  |  | $ | 20,658 |
(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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