Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Sep. 30, 2023
Receivables [Abstract]
Finance contracts maximum funding period	30 days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 48,519	$ 113,878
Less – allowance for credit losses	(634)	(703)
Total accounts receivable, net	47,885	113,175
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	24,888	32,065
Contracts in transit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	14,865	25,425
Manufacturer receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	8,766	11,288
Receivable for proceeds on the disposition of a business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 0	$ 45,100