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Business Combinations - Additional Information (Detail) $ in Thousands	9 Months Ended
	Jun. 30, 2015 USD ($) PartnershipUnit	Sep. 30, 2014 USD ($)
Business Acquisition [Line Items]
Number of heating oil dealer acquired | PartnershipUnit	1
Aggregate purchase price partnership acquired	$ 1,100
Gross purchase price allocation, intangible assets	300
Goodwill	209,404	$ 209,331
Gross purchase price allocation, fixed assets	700
Propane Dealer
Business Acquisition [Line Items]
Goodwill	$ 100

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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.

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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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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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