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Business Combinations - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 USD ($) PartnershipUnit | Sep. 30, 2017 USD ($) PartnershipUnit | Sep. 30, 2016 USD ($) PartnershipUnit
Business Acquisition [Line Items] |  |  |
Number of dealers acquired | PartnershipUnit | 6 | 7 | 4
Goodwill | $ 228,436 | $ 225,915 | $ 212,760
Heating Oil Dealer and Motor Fuel Dealer |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price partnership acquired | 25,200 |  |
Cash paid | 23,700 |  |
Deferred liabilities | 1,500 |  |
Aggregate purchase price allocation, intangible assets | 15,300 |  |
Aggregate purchase price allocation, fixed assets | 7,500 |  |
Gross purchase price increased (reduced) by working capital credits | $ 2,400 |  |
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 |
Aggregate purchase price allocation, intangible assets |  | 37,500 |
Aggregate purchase price allocation, fixed assets |  | 10,200 |
Gross purchase price increased (reduced) by working capital credits |  | (2,900) |
Contingent consideration |  | $ 600 |
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 increased (reduced) by working capital credits |  |  | (100)
Goodwill |  |  | $ 1,700

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