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Derivatives and Hedging Disclosures and Fair Value Measurements (Details) (Commodity contracts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Derivative Assets, commodity contracts	$ 15,100	$ 41,788
Derivative Liabilities, commodity contracts	(10,549)	(41,275)
Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] | Cost of product [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Amount of (Gain) or Loss Recognized, commodity contracts	18,636	(9,089)	24,412
Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] | Cost of installations and service [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Amount of (Gain) or Loss Recognized, commodity contracts	(284)	(1,030)	(958)
Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] | Delivery and branch expenses [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Amount of (Gain) or Loss Recognized, commodity contracts	(82)	(740)	(512)
Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 [Member] | Increase / decrease in fair value of derivative instruments [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Amount of (Gain) or Loss Recognized, commodity contracts	(8,549)	2,567	(5,622)
Fair asset and fair liability value of derivative instruments [Member] | Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Derivative Assets, commodity contracts	15,100	41,531
Fair liability and fair asset value of derivative instruments [Member] | Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Derivative Liabilities, commodity contracts	(10,549)	(41,179)
Long-term derivative liabilities included in other long-term liabilities [Member] | Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Derivative Assets, commodity contracts		257
Derivative Liabilities, commodity contracts		(96)
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Derivative Assets, commodity contracts	1,749	721
Derivative Liabilities, commodity contracts	(1,898)	(627)
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Fair asset and fair liability value of derivative instruments [Member] | Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Derivative Assets, commodity contracts	1,749	550
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Fair liability and fair asset value of derivative instruments [Member] | Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Derivative Liabilities, commodity contracts	(1,898)	(602)
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Long-term derivative liabilities included in other long-term liabilities [Member] | Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Derivative Assets, commodity contracts		171
Derivative Liabilities, commodity contracts		(25)
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Derivative Assets, commodity contracts	13,351	41,067
Derivative Liabilities, commodity contracts	(8,651)	(40,648)
Significant Other Observable Inputs Level 2 [Member] | Fair asset and fair liability value of derivative instruments [Member] | Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Derivative Assets, commodity contracts	13,351	40,981
Significant Other Observable Inputs Level 2 [Member] | Fair liability and fair asset value of derivative instruments [Member] | Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Derivative Liabilities, commodity contracts	(8,651)	(40,577)
Significant Other Observable Inputs Level 2 [Member] | Long-term derivative liabilities included in other long-term liabilities [Member] | Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Derivative Assets, commodity contracts		86
Derivative Liabilities, commodity contracts		(71)
Significant unobservable Inputs Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Derivative Assets, commodity contracts
Derivative Liabilities, commodity contracts
Significant unobservable Inputs Level 3 [Member] | Fair asset and fair liability value of derivative instruments [Member] | Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Derivative Assets, commodity contracts
Significant unobservable Inputs Level 3 [Member] | Fair liability and fair asset value of derivative instruments [Member] | Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Derivative Liabilities, commodity contracts
Significant unobservable Inputs Level 3 [Member] | Long-term derivative liabilities included in other long-term liabilities [Member] | Fair Value, Measurements, Recurring [Member]
Partnership's financial assets and liabilities measured at fair value on a recurring basis
Derivative Assets, commodity contracts
Derivative Liabilities, commodity contracts

X

- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ 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 (a),(c),(d),(e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959

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X

- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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X

- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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