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Business Combinations and Divestitures - Additional Information (Detail) $ in Thousands	3 Months Ended
	Dec. 31, 2024 USD ($) PartnershipUnit	Dec. 31, 2023 USD ($) PartnershipUnit	Sep. 30, 2024 USD ($)
Business Acquisition [Line Items]
Goodwill	$ 276,074		$ 275,829
Heating Oil Businesses
Business Acquisition [Line Items]
Number of businesses acquired | PartnershipUnit	1	2
Cash and assuming	$ 700	$ 2,500
Aggregate purchase price allocation, intangible assets	800	2,700
Goodwill	400	200
Aggregate purchase price allocation, fixed assets	300	800
Gross purchase price increased (reduced) by working capital credits	(800)	$ (1,200)
Cash proceeds from sale of assets	$ 300

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