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Business Combinations - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 USD ($) PartnershipUnit | Sep. 30, 2019 USD ($) PartnershipUnit | Sep. 30, 2018 USD ($) PartnershipUnit
Heating Oil Dealers |  |  |
Business Acquisition [Line Items] |  |  |
Number of businesses acquired | PartnershipUnit | 2 |  | 5
Aggregate purchase price partnership acquired | $ 3,300 |  |
Cash paid | 3,000 |  |
Deferred liabilities | 300 |  |
Aggregate purchase price allocation, intangible assets | 3,200 |  |
Aggregate purchase price allocation, fixed assets | 600 |  |
Gross purchase price increased (reduced) by working capital credits | (500) |  |
Fiscal 2019 Acquisition |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price partnership acquired | $ 1,200 |  |
Liquid Product Dealers |  |  |
Business Acquisition [Line Items] |  |  |
Number of businesses acquired | PartnershipUnit |  | 1 |
Acquired Business |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price partnership acquired |  | $ 60,904 |
Aggregate purchase price allocation, fixed assets |  | $ 14,926 |
Motor Fuel Dealer |  |  |
Business Acquisition [Line Items] |  |  |
Number of businesses acquired | PartnershipUnit |  |  | 1
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

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