v3.25.2
Mergers - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2024
USD ($)
$ / shares
shares
Jun. 29, 2025
USD ($)
Jun. 30, 2024
USD ($)
$ / shares
Jun. 29, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 29, 2025
USD ($)
Business Combination [Line Items]            
Merger agreement, shares of common stock converted per share (in shares) | shares 1          
Common stock, par value (in dollars per share) | $ / shares $ 0.01          
Dividend declared per Cedar Fair Unit (in dollars per share) | $ / shares     $ 0.90      
Former Six Flags            
Business Combination [Line Items]            
Cumulative net measurement period adjustment goodwill increased       $ 590,800   $ 590,790
Accounts receivable acquired $ 84,853 $ 90,792   90,792   $ 90,792
Net revenues of acquiree since the acquisition date   388,700   499,700    
Net loss of acquiree since the acquisition date   $ 101,000   $ 234,500    
Net revenues on pro forma basis     $ 1,010,000   $ 1,250,000  
Net loss on pro forma basis     81,800   159,100  
Acquisition-related costs     $ 8,400   $ 14,900  
Former Six Flags | Financial Asset, Not Purchased with Credit Deterioration            
Business Combination [Line Items]            
Accounts receivable acquired 90,800          
Cedar Fair First Merger | Additional Paid-in-Capital            
Business Combination [Line Items]            
Deferred tax assets recorded within additional paid in capital $ 312,800          
Six Flags            
Business Combination [Line Items]            
Corporate ownership interest (as percent) 51.20%          
Former Six Flags            
Business Combination [Line Items]            
Merger agreement, exchange ratio 0.5800          
Former Six Flags | Six Flags Entertainment Corporation            
Business Combination [Line Items]            
Corporate ownership interest (as percent) 48.80%          
Former Six Flags            
Business Combination [Line Items]            
Common stock, par value (in dollars per share) | $ / shares $ 0.025          
Dividend declared (in dollars per share) | $ / shares     $ 1.53      
Component of dividend declared (in dollars per share) | $ / shares     $ 1.00