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Business Combinations - Additional Information (Detail) $ in Thousands	6 Months Ended
	Mar. 31, 2017 USD ($) PartnershipUnit	Sep. 30, 2016 USD ($)
Business Acquisition [Line Items]
Goodwill	$ 213,881	$ 212,760
Number of heating oil dealer acquired | PartnershipUnit	2
Heating Oil Dealer, Propane Dealer and Plumbing Service Provider
Business Acquisition [Line Items]
Aggregate purchase prices partnership acquired	$ 9,200
Cash paid	7,700
Deferred liability	1,500
Contingent consideration	600
Aggregate purchase price allocation, intangible assets	3,900
Goodwill	1,100
Aggregate purchase price allocation, fixed assets	4,300
Gross purchase price reduced by working capital credits	$ (100)

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Working Capital

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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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