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Business Combinations - Additional Information (Detail) $ in Millions | 9 Months Ended
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Jun. 30, 2018 USD ($) PartnershipUnit
Business Acquisition [Line Items] |
Number of dealers acquired | PartnershipUnit | 3
Heating Oil Dealer and Motor Fuel Dealer |
Business Acquisition [Line Items] |
Aggregate purchase price partnership acquired | $ 22.8
Cash paid | 21.3
Deferred liabilities | 1.5
Aggregate purchase price allocation, intangible assets | 12.7
Aggregate purchase price allocation, fixed assets | 6.9
Aggregate purchase price allocation, working capital | $ 3.2

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