Acquisitions and Dispositions - Narrative (Details) $ in Thousands		12 Months Ended
	Oct. 31, 2023 USD ($)	Sep. 30, 2025 USD ($) location	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($) renewal_option property	Sep. 01, 2023 location
Business Combination [Line Items]
Revenue from contract with customer		$ 1,872,334	$ 1,772,630	$ 1,936,310
Net (loss) income before income tax expense		$ (151,531)	(6,333)	(42,523)
Costs related to acquisition			100	1,200
Number of retail locations | location		95
Consideration transferred				42,000
Cash paid for acquisition		$ (713)	5,712	28,882
Noncash acquisition purchase price funded by affiliate financing		0	0	10,600
Contingent consideration, liability				2,600
Goodwill expected to be deductible for tax purposes			0	15,900
Total Acquisitions
Business Combination [Line Items]
Revenue from contract with customer			$ 7,000	60,900
Net (loss) income before income tax expense		$ 200		6,300
Consideration transferred				$ 42,032
Quality Assets And Operations, LLC
Business Combination [Line Items]
Company owns economic interest	20.00%
Economic interest percentage	100.00%
Consideration transferred	$ 18,800
Harbor Pointe Marina
Business Combination [Line Items]
Number of retail locations | location					1
Harbor View Marine
Business Combination [Line Items]
Number of retail locations | property				2
Gain (loss) on sale and leaseback transaction				$ 0
Term of contract				15 years
Number of lease renewal options | renewal_option				2
Renewal term			5 years