LONG-TERM DEBT - Schedule of Debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Jan. 01, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Total principal amount	$ 267.4		$ 301.8
Less: Unamortized discount and debt issuance costs	(16.3)		(27.5)
Total debt payments	251.1		274.3
Less: Current portion of long-term debt	(39.1)		(35.6)
Long-term debt	212.0		238.7
Term Loan Credit Agreement due August 2026
Debt Instrument [Line Items]
Long-term debt	$ 227.1		248.7
Variable interest rate	6.75%
Fair value debt	$ 243.8
Stated interest rate	6.75%
Convertible senior 6.75% promissory notes due January 2025
Debt Instrument [Line Items]
Long-term debt	$ 38.8		38.8
Fair value debt	40.0
Stated interest rate		6.75%
RumbleOn Finance line of credit due February 2025
Debt Instrument [Line Items]
Long-term debt	0.0		$ 12.2
Stated interest rate			12.80%
RideNow Management Notes Payable
Debt Instrument [Line Items]
Long-term debt	$ 1.5		$ 2.1

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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