Segment Information - Narrative (Details)	12 Months Ended
	Sep. 30, 2021 state segment
Segment Reporting [Abstract]
Number of reportable segments | segment	4
Number of states to which product sale with propane revenue | state	50
France | Geographic Concentration Risk | Revenues
Segment Reporting Information [Line Items]
Concentration risk, percentage (as a percentage)	20.00%
France | Geographic Concentration Risk | Long-lived Assets
Segment Reporting Information [Line Items]
Concentration risk, percentage (as a percentage)	10.00%