v3.26.1
Business Acquisitions and Dispositions - Additional Information (Details)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
retail_Units
Mar. 31, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
retail_Units
retailUnits
Jun. 30, 2025
USD ($)
retail_Units
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Mid-line import franchise              
Business Combination [Line Items]              
Number of franchises disposed | retail_Units       3      
Number of franchises disposed | retail_Units       5      
Proceeds from sales of dealerships       $ 40,500,000 $ 0    
Number of acquired franchises | retail_Units         4    
Business Combination, Recognized Asset Acquired, Inventory, Current $ 13,200,000     13,200,000      
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment 800,000     800,000      
Business Combination, Recognized Liability Assumed, Other Liability, Current (1,600,000)     (1,600,000)      
Payments to Acquire Businesses, Gross       66,300,000      
PY Acq GW Allocations Fdealer           $ (200,000)  
PY Acq GW Allocations Powersports   $ 0          
number of powersport stores with GW Adjustment              
Gain on Franchise Disposal     $ 2,400,000 (5,100,000) $ 2,700,000    
GainLossOnExitOfLeasedDealerships     (1,000,000.0) (3,600,000)      
Impairment charges 0   (172,400,000) (400,000) (173,800,000)    
Excluded storm-related physical damage and legal costs 1,200,000   4,100,000   5,000,000.0    
Business Combination, Acquiree's Revenue, Prior Period             $ 15,263,500,000
Business Acquisition, Earnings Reported by Acquired Entity for Last Annual Period             $ 174,100,000
Business Combination, Goodwill, Expected Tax Deductible, Amount 13,600,000     13,600,000      
Business Combination, Acquiree's Earnings (Loss) since Acquisition Date, Actual       1,000,000.0      
Business Combination, Recognized Liability Assumed, Lease Obligation (8,000,000.0)     (8,000,000.0)      
Goodwill and Intangible Assets Acquired   $ 64,200,000   13,600,000      
RevenueEarningsIncludedInStatementofOperationsAttributableToAcquisitions       19,000,000.0      
Proceeds from Divestiture of Businesses       60,000,000.0      
Proceeds from Sale of Real Estate     (800,000)        
Loss (gain) on disposal of dealerships and property and equipment       (1,100,000) 3,800,000    
Gain (loss) on disposal       5,100,000      
Excluded storm-related physical damage and legal costs 1,200,000   4,100,000   5,000,000.0    
Gain on Franchise Disposal     2,400,000 (5,100,000) 2,700,000    
Impairment charges $ 0   (172,400,000) (400,000) (173,800,000)    
GainLossOnExitOfLeasedDealerships     (1,000,000.0) (3,600,000)      
Payments to Acquire Businesses, Gross       $ 66,300,000      
Powersports Segment              
number of powersport stores with GW Adjustment              
Significant Changes, Franchised Outlets in Operation | retail_Units 1     1      
ROU asset              
Business Combination [Line Items]              
Restructuring Costs       $ 7,900,000      
JLR 4 Pack [Member]              
Business Combination [Line Items]              
Business Combination, Recognized Asset Acquired, Other Asset, Current $ 100,000     $ 100,000      
Insurance Settlement [Member]              
number of powersport stores with GW Adjustment              
Other Nonrecurring Gain (Loss)         (40,000,000.0)    
Other Nonrecurring Gain     $ (10,000,000.0)        
Other Nonrecurring Gain (Loss)         (40,000,000.0)    
Powersports Segment              
Business Combination [Line Items]              
Number of acquired franchises | retailUnits       1      
Number of Powersports Stores Acquired | retail_Units       6      
number of powersport stores with GW Adjustment              
Impairment charges 6,500,000            
Other Asset Impairment Charges         $ 400,000    
Intangible Asset, Impairment, Description         7.2 million    
Impairment charges 6,500,000            
Powersports Dealerships              
Business Combination [Line Items]              
Payments to Acquire Businesses, Gross       $ 66,200,000      
number of powersport stores with GW Adjustment              
Payments to Acquire Businesses, Gross       66,200,000      
EchoPark Segment [Member]              
number of powersport stores with GW Adjustment              
Impairment charges         $ 200,000    
Impairment charges         200,000    
Franchise              
number of powersport stores with GW Adjustment              
Impairment charges       400,000      
Impairment charges       $ 400,000      
domestic franchise dealership [Domain]              
Business Combination [Line Items]              
Number of franchises disposed | retail_Units       1      
Number of franchises terminated       1      
Powersports Segment              
number of powersport stores with GW Adjustment              
Business Combination, Recognized Asset Acquired, Asset $ 40,300,000     $ 40,300,000      
Franchised Dealerships Acquired              
Business Combination [Line Items]              
Business acquisition, consideration amount         $ 359,900,000