v3.26.1
Earnings per Share - Schedule of Share Amounts Used in Calculating Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 28, 2026
Jun. 29, 2025
Jun. 28, 2026
Jun. 29, 2025
Earnings Per Share [Abstract]        
Net loss attributable to Six Flags Entertainment Corporation $ (202,620) $ (99,648) $ (471,220) $ (319,366)
Basic weighted average shares of common stock (in shares) 101,731 100,652 101,610 100,376
Diluted weighted average shares of common stock (in shares) 101,731 100,652 101,610 100,376
Basic (in dollars per share) $ (1.99) $ (0.99) $ (4.64) $ (3.18)
Diluted (in dollars per share) $ (1.99) $ (0.99) $ (4.64) $ (3.18)