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Derivatives and Hedging-Disclosures and Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2016
Partnership's Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The Partnership’s 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, 2016 |
Commodity contracts |  | Fair asset and fair liability value of derivative instruments |  | $ | 11,692 |  |  | $ | — |  |  | $ | 11,692 |
Commodity contracts |  | Long-term derivative assets included in the other long-term liabilities balance |  |  | 1,369 |  |  |  | 481 |  |  |  | 888 |
Commodity contract assets at September 30, 2016 |  | $ | 13,061 |  |  | $ | 481 |  |  | $ | 12,580 |
Liability Derivatives at September 30, 2016 |
Commodity contracts |  | Fair liability and fair asset value of derivative instruments |  | $ | (9,990 | ) |  | $ | (1,603 | ) |  | $ | (8,387 | )
Commodity contracts |  | Cash collateral |  |  | — |  |  |  | — |  |  |  | — |
Commodity contracts |  | Long-term derivative liabilities included in the other long-term liabilities balance |  |  | (565 | ) |  |  | (484 | ) |  |  | (81 | )
Commodity contract liabilities at September 30, 2016 |  | $ | (10,555 | ) |  | $ | (2,087 | ) |  | $ | (8,468 | )
Asset Derivatives at September 30, 2015 |
Commodity contracts |  | Fair asset and fair liability value of derivative instruments |  | $ | 26,628 |  |  | $ | 930 |  |  | $ | 25,698 |
Commodity contracts |  | Long-term derivative assets included in the other long-term liabilities balance |  |  | 4,975 |  |  |  | 2,017 |  |  |  | 2,958 |
Commodity contract assets at September 30, 2015 |  | $ | 31,603 |  |  | $ | 2,947 |  |  | $ | 28,656 |
Liability Derivatives at September 30, 2015 |
Commodity contracts |  | Fair liability and fair asset value of derivative instruments |  | $ | (41,270 | ) |  | $ | — |  |  | $ | (41,270 | )
Commodity contracts |  | Cash collateral |  |  | 2,758 |  |  |  | 2,758 |  |  |  | — |
Commodity contracts |  | Long-term derivative liabilities included in the other long-term liabilities balance |  |  | (5,977 | ) |  |  | (2,038 | ) |  |  | (3,939 | )
Commodity contract liabilities at September 30, 2015 |  | $ | (44,489 | ) |  | $ | 720 |  |  | $ | (45,209 | )
Partnership's Derivatives Assets (Liabilities) Offset by Counterparty | The Partnership’s 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 |  | $ | 7,716 |  |  | $ | (3,729 | ) |  | $ | 3,987 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,987 |
Long-term derivative assets included in other long-term assets, net |  |  | 888 |  |  |  | (81 | ) |  |  | 807 |  |  |  | — |  |  |  | — |  |  |  | 807 |
Fair liability value of derivative instruments |  |  | 3,976 |  |  |  | (6,261 | ) |  |  | (2,285 | ) |  |  | — |  |  |  | — |  |  |  | (2,285 | )
Long-term derivative liabilities included in other long-term liabilities, net |  |  | 481 |  |  |  | (484 | ) |  |  | (3 | ) |  |  | — |  |  |  | — |  |  |  | (3 | )
Total at September 30, 2016 |  | $ | 13,061 |  |  | $ | (10,555 | ) |  | $ | 2,506 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,506 |
Fair asset value of derivative instruments |  | $ | 935 |  |  | $ | — |  |  | $ | 935 |  |  | $ | — |  |  | $ | — |  |  | $ | 935 |
Fair liability value of derivative instruments |  |  | 25,693 |  |  |  | (38,512 | ) |  |  | (12,819 | ) |  |  | — |  |  |  | — |  |  |  | (12,819 | )
Long-term derivative liabilities included in other long-term liabilities, net |  |  | 4,975 |  |  |  | (5,977 | ) |  |  | (1,002 | ) |  |  |  |  |  |  |  |  |  |  | (1,002 | )
Total at September 30, 2015 |  | $ | 31,603 |  |  | $ | (44,489 | ) |  | $ | (12,886 | ) |  | $ | — |  |  | $ | — |  |  | $ | (12,886 | )
Partnership's Derivatives Assets (Liabilities) Offset by Counterparty | The Partnership’s 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 |  | $ | 7,716 |  |  | $ | (3,729 | ) |  | $ | 3,987 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,987 |
Long-term derivative assets included in other long-term assets, net |  |  | 888 |  |  |  | (81 | ) |  |  | 807 |  |  |  | — |  |  |  | — |  |  |  | 807 |
Fair liability value of derivative instruments |  |  | 3,976 |  |  |  | (6,261 | ) |  |  | (2,285 | ) |  |  | — |  |  |  | — |  |  |  | (2,285 | )
Long-term derivative liabilities included in other long-term liabilities, net |  |  | 481 |  |  |  | (484 | ) |  |  | (3 | ) |  |  | — |  |  |  | — |  |  |  | (3 | )
Total at September 30, 2016 |  | $ | 13,061 |  |  | $ | (10,555 | ) |  | $ | 2,506 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,506 |
Fair asset value of derivative instruments |  | $ | 935 |  |  | $ | — |  |  | $ | 935 |  |  | $ | — |  |  | $ | — |  |  | $ | 935 |
Fair liability value of derivative instruments |  |  | 25,693 |  |  |  | (38,512 | ) |  |  | (12,819 | ) |  |  | — |  |  |  | — |  |  |  | (12,819 | )
Long-term derivative liabilities included in other long-term liabilities, net |  |  | 4,975 |  |  |  | (5,977 | ) |  |  | (1,002 | ) |  |  |  |  |  |  |  |  |  |  | (1,002 | )
Total at September 30, 2015 |  | $ | 31,603 |  |  | $ | (44,489 | ) |  | $ | (12,886 | ) |  | $ | — |  |  | $ | — |  |  | $ | (12,886 | )
Partnership'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 |  | 2016 |  |  | 2015 |  |  | 2014 |
Commodity contracts |  | Cost of product (a) |  | $ | 16,977 |  |  | $ | 13,368 |  |  | $ | 11,781 |
Commodity contracts |  | Cost of installations and service (a) |  | $ | 949 |  |  | $ | 1,831 |  |  | $ | (202 | )
Commodity contracts |  | Delivery and branch expenses (a) |  | $ | 2,405 |  |  | $ | 2,098 |  |  | $ | (104 | )
Commodity contracts |  | (Increase) / decrease in the fair value of derivative instruments (b) |  | $ | (18,217 | ) |  | $ | 4,187 |  |  | $ | 6,566 |
(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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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure for other derivative instruments not designated as hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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