Investments in and Acquisitions and Dispositions of Businesses - Summary of Acquisition and Purchase Price Allocation (Parenthetical) (Details)	12 Months Ended
Sep. 30, 2023 Business
North Carolina [Member]
Business Acquisition [Line Items]
Number of propane assets and operations acquired	1
New Mexico [Member]
Business Acquisition [Line Items]
Number of propane assets and operations acquired	1
Washington [Member]
Business Acquisition [Line Items]
Number of propane assets and operations acquired	1

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479907/805-20-50-5

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration