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Derivatives and Hedging-Disclosures and Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2020
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, 2020 |
Commodity contracts |  | Fair liability value of derivative instruments |  | $ | 24,274 |  |  | $ | — |  |  | $ | 24,274 |
Commodity contracts |  | Long-term derivative liabilities included in the deferred charges and other assets, net and other long-term liabilities, net balances |  |  | 1,890 |  |  |  | — |  |  |  | 1,890 |
Commodity contract assets at September 30, 2020 |  | $ | 26,164 |  |  | $ | — |  |  | $ | 26,164 |
Liability Derivatives at September 30, 2020 |
Commodity contracts |  | Fair liability value of derivative instruments |  | $ | (35,711 | ) |  | $ | — |  |  | $ | (35,711 | )
Commodity contracts |  | Long-term derivative liabilities included in the deferred charges and other assets, net and other long-term liabilities, net balances |  |  | (1,779 | ) |  |  | — |  |  |  | (1,779 | )
Commodity contract liabilities at September 30, 2020 |  | $ | (37,490 | ) |  | $ | — |  |  | $ | (37,490 | )
Asset Derivatives at September 30, 2019 |
Commodity contracts |  | Fair liability value of derivative instruments |  | $ | 13,824 |  |  | $ | — |  |  | $ | 13,824 |
Commodity contracts |  | Long-term derivative liabilities included in the deferred charges and other assets, net and other long-term liabilities, net balances |  |  | 1,466 |  |  |  | — |  |  |  | 1,466 |
Commodity contract assets at September 30, 2019 |  | $ | 15,290 |  |  | $ | — |  |  | $ | 15,290 |
Liability Derivatives at September 30, 2019 |
Commodity contracts |  | Fair liability value of derivative instruments |  | $ | (22,086 | ) |  | $ | — |  |  | $ | (22,086 | )
Commodity contracts |  | Long-term derivative liabilities included in the deferred charges and other assets, net and other long-term liabilities, net balances |  |  | (1,719 | ) |  |  | — |  |  |  | (1,719 | )
Commodity contract liabilities at September 30, 2019 |  | $ | (23,805 | ) |  | $ | — |  |  | $ | (23,805 | )
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 other long-term assets, net |  | $ | 1,605 |  |  | $ | (1,478 | ) |  | $ | 127 |  |  | $ | — |  |  | $ | — |  |  | $ | 127 |
Fair liability value of derivative instruments |  |  | 24,274 |  |  |  | (35,711 | ) |  |  | (11,437 | ) |  |  | — |  |  |  | — |  |  |  | (11,437 | )
Long-term derivative liabilities included in other long-term liabilities, net |  |  | 285 |  |  |  | (301 | ) |  |  | (16 | ) |  |  | — |  |  |  | — |  |  |  | (16 | )
Total at September 30, 2020 |  | $ | 26,164 |  |  | $ | (37,490 | ) |  | $ | (11,326 | ) |  | $ | — |  |  | $ | — |  |  | $ | (11,326 | )
Long-term derivative assets included in other long-term assets, net |  | $ | 16 |  |  | $ | (16 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Fair liability value of derivative instruments |  |  | 13,824 |  |  |  | (22,086 | ) |  |  | (8,262 | ) |  |  | — |  |  |  | — |  |  |  | (8,262 | )
Long-term derivative liabilities included in other long-term liabilities, net |  |  | 1,450 |  |  |  | (1,703 | ) |  |  | (253 | ) |  |  | — |  |  |  | — |  |  |  | (253 | )
Total at September 30, 2019 |  | $ | 15,290 |  |  | $ | (23,805 | ) |  | $ | (8,515 | ) |  | $ | — |  |  | $ | — |  |  | $ | (8,515 | )
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 other long-term assets, net |  | $ | 1,605 |  |  | $ | (1,478 | ) |  | $ | 127 |  |  | $ | — |  |  | $ | — |  |  | $ | 127 |
Fair liability value of derivative instruments |  |  | 24,274 |  |  |  | (35,711 | ) |  |  | (11,437 | ) |  |  | — |  |  |  | — |  |  |  | (11,437 | )
Long-term derivative liabilities included in other long-term liabilities, net |  |  | 285 |  |  |  | (301 | ) |  |  | (16 | ) |  |  | — |  |  |  | — |  |  |  | (16 | )
Total at September 30, 2020 |  | $ | 26,164 |  |  | $ | (37,490 | ) |  | $ | (11,326 | ) |  | $ | — |  |  | $ | — |  |  | $ | (11,326 | )
Long-term derivative assets included in other long-term assets, net |  | $ | 16 |  |  | $ | (16 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Fair liability value of derivative instruments |  |  | 13,824 |  |  |  | (22,086 | ) |  |  | (8,262 | ) |  |  | — |  |  |  | — |  |  |  | (8,262 | )
Long-term derivative liabilities included in other long-term liabilities, net |  |  | 1,450 |  |  |  | (1,703 | ) |  |  | (253 | ) |  |  | — |  |  |  | — |  |  |  | (253 | )
Total at September 30, 2019 |  | $ | 15,290 |  |  | $ | (23,805 | ) |  | $ | (8,515 | ) |  | $ | — |  |  | $ | — |  |  | $ | (8,515 | )
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 |  | 2020 |  |  | 2019 |  |  | 2018 |
Commodity contracts |  | Cost of product (a) |  | $ | 10,462 |  |  | $ | 9,266 |  |  | $ | 10,379 |
Commodity contracts |  | Cost of installations and service (a) |  | $ | 607 |  |  | $ | 836 |  |  | $ | (726 | )
Commodity contracts |  | Delivery and branch expenses (a) |  | $ | 1,634 |  |  | $ | 596 |  |  | $ | (1,403 | )
Commodity contracts |  | (Increase) / decrease in the fair value of derivative instruments (b) |  | $ | 2,755 |  |  | $ | 25,113 |  |  | $ | (11,408 | )
(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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