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Business Combinations (Details) $ in Thousands	3 Months Ended				9 Months Ended
Business Combinations (Details) $ in Thousands	Mar. 31, 2023 USD ($) retail_Units Business	Mar. 31, 2022 USD ($) Business	Mar. 31, 2022 USD ($) retail_Units	Mar. 31, 2022 USD ($)	Sep. 30, 2023 USD ($) retail_Units	Sep. 30, 2022 USD ($)
Business Combinations [Abstract]
Number of franchises disposed	0	0	1
Asset Acquisition [Line Items]
Number of franchises disposed	0	0	1
RFJ
Asset Acquisition [Line Items]
Business acquisition, consideration amount	$ 964,900
Business acquisition, consideration amount	$ 964,900
EchoPark Segment [Member]
Asset Acquisition [Line Items]
Number of acquired franchises \| Business	0
Stand-alone pre-owned vehicle business
Asset Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory					$ 11,600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill					22,600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment					700
Goodwill, Acquired During Period					$ 11,400
Franchised [Member]
Asset Acquisition [Line Items]
Number of acquired franchises \| retail_Units					2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory						$ 4,900
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill						6,400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment						100
Goodwill, Acquired During Period				$ 1,300
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other		$ 1,100	$ 1,100	1,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		$ (100)	$ (100)	$ (100)
Franchised Dealerships Acquired
Asset Acquisition [Line Items]
Business acquisition, consideration amount						13,700
Business acquisition, consideration amount						$ 13,700
Powersports Segment
Asset Acquisition [Line Items]
Number of acquired franchises \| retail_Units					1
Business acquisition, consideration amount					$ 75,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land					29,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other					100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities					(300)
Business acquisition, consideration amount					$ 75,100