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Business Combinations - Additional Information (Detail) - Propane Dealer $ in Millions | 6 Months Ended
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Mar. 31, 2019 USD ($)
Business Acquisition [Line Items] |
Aggregate purchase price partnership acquired | $ 13.7
Aggregate purchase price allocation, intangible assets | 11.2
Aggregate purchase price allocation, fixed assets | 2.7
Gross purchase price increased (reduced) by working capital credits | $ (0.2)

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