Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 ($) $ / shares	Jun. 29, 2025 USD ($) $ / shares	Jun. 28, 2026 $ / shares	Dec. 31, 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	$ 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