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Mergers - Narrative (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jul. 01, 2024
$ / shares
shares
Jun. 29, 2025
USD ($)
Jun. 29, 2025
USD ($)
Mar. 29, 2026
$ / shares
Dec. 31, 2025
$ / shares
Mar. 30, 2025
$ / shares
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) $ 0.01     $ 0.01 $ 0.01 $ 0.01
Former Six Flags            
Business Combination [Line Items]            
Cumulative net measurement period adjustment goodwill increased | $   $ 590,800 $ 590,790      
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) $ 0.025