Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance contracts maximum funding period	30 days
Total accounts receivable	$ 73,820	$ 113,878
Less – allowance for credit losses	(551)	(703)
Total accounts receivable, net	73,269	113,175
Receivable for proceeds on the disposition of a business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	0	45,100
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	32,578	32,065
Contracts in transit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	20,437	25,425
Manufacturer receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	11,435	11,288
Income tax receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 9,370	$ 0