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Business Combinations - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 USD ($) PartnershipUnit | Sep. 30, 2016 USD ($) PartnershipUnit | Sep. 30, 2015 USD ($) PartnershipUnit
Business Acquisition [Line Items] |  |  |
Aggregate purchase price partnership acquired |  |  | $ 21,100
Aggregate purchase price allocation, intangible assets |  |  | 20,700
Aggregate purchase price allocation, fixed assets |  |  | 2,500
Gross purchase price reduced by working capital credits |  |  | $ (2,100)
Number of dealers acquired | PartnershipUnit | 7 | 4 | 2
Goodwill | $ 225,915 | $ 212,760 | $ 211,045
Heating Oil Dealer, Propane Dealer and Plumbing Service Provider |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price partnership acquired | 44,800 |  |
Cash paid | 43,300 |  |
Deferred liabilities | 1,500 |  |
Contingent consideration | 600 |  |
Aggregate purchase price allocation, intangible assets | 37,500 |  |
Aggregate purchase price allocation, fixed assets | 10,200 |  |
Gross purchase price reduced by working capital credits | $ (2,900) |  |
Heating Oil Dealer, Motor Fuel Dealer and Propane Dealer |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price partnership acquired |  | 9,800 |
Aggregate purchase price allocation, intangible assets |  | 5,700 |
Aggregate purchase price allocation, fixed assets |  | 2,500 |
Gross purchase price reduced by working capital credits |  | (100) |
Goodwill |  | $ 1,700 |

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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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: 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 + Details
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