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Business Combinations - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2013 PartnershipUnit | Sep. 30, 2012 PartnershipUnit | Sep. 30, 2011 PartnershipUnit
Redomestication [Line Items] |  |  |
Number of heating oil dealer acquired | 2 | 7 | 4
Aggregate purchase price partnership acquired | $ 1.4 | $ 39.2 | $ 9.7
Gross purchase price allocation, intangible assets | 1.3 | 32.4 | 4.3
Gross purchase price allocation, fixed assets | 0.2 | 8.0 | 3.5
Gross purchase price reduced by working capital credits | 0.1 | 1.2 |
Gross purchase price allocation, working capital |  |  | $ 1.9

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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Working Capital + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital + References No definition available. + Details
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- Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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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 + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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