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Business Combinations - Additional Information (Detail) - Propane Dealer $ in Millions	6 Months Ended
	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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- Definition

Business combination, recognized identifiable assets acquired and liabilities assumed, net working capital.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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