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Business Combination - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 30, 2013 PartnershipUnit
Redomestication [Line Items]
Number of heating oil dealer acquired	1
Aggregate purchase price partnership acquired	$ 0.6
Gross purchase price allocation,intangible assets	0.6
Gross purchase price allocation, fixed assets	0.1
Gross purchase price reduced by working capital credits	$ 0.1

X

- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Working Capital

+ References

No definition available.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477



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-Name Accounting Standards Codification

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-Section 30

-Paragraph 8

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-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

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- Definition

The amount of property, plant, and equipment recognized as of the acquisition date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

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-Paragraph 37

-URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464

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- Definition

The number of businesses acquired by the entity during the period.

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